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The design of the brake system of the car Renault Sandero Stepway
Renault Sandero Stepway is equipped with two independent brake systems: working and parking.
The first, equipped with a hydraulic drive with a vacuum booster and an anti-lock braking system (depending on the configuration), provides braking when the car is moving, the second slows down the car in the parking lot.
The working system is dual-circuit with a diagonal connection of the brake mechanisms of the front and rear wheels. One hydraulic drive circuit ensures the operation of the right front and left rear brake mechanisms, the other - the left front and right rear.
If one of the circuits of the service brake system fails, the second circuit is used to stop the Renault Sandero Stepway car with sufficient efficiency. The hydraulic drive includes a vacuum booster and a dual-circuit rear brake pressure regulator.
A parking brake system with a cable drive is installed on the car on the brakes of the rear wheels.
Rice. 21. Renault Sandero Stepway front wheel brake mechanism
1 - brake hose; 2 - air release valve; 3 - guide pin cover; 4 - brake disc; 5 - brake pads; 6 - brake caliper; 7 - shoe guide
The Renault Sandero Stepway front brake mechanism is disc, with automatic adjustment of the gap between the pads 5 (Fig. 21) and disc 4, with a floating caliper. The movable bracket is formed by a caliper 6 with a single-piston working cylinder.
The shoe guide 7 is bolted to the steering knuckle. The movable bracket is bolted to the guide pins 3 installed in the holes of the guide shoe. The guide pins are grease lubricated and protected by rubber boots.
A piston with a sealing ring is installed in the cavity of the wheel cylinder. Due to the elasticity of this ring, an optimal clearance is maintained between the pads and the disc, the surface of which is protected by the brake shield.
When braking, the piston, under the influence of fluid pressure, presses the inner pad against the disc, as a result of the reaction force, the caliper moves on the fingers and the outer pad is also pressed against the disc, while the pressing force of the pads is the same.
When releasing the piston, due to the elasticity of the sealing ring, it is removed from the pad, a small gap forms between the pads and the disc.
Rice. 22. Renault Sandero Stepway brake master cylinder with reservoir
1 - tank cap; 2 - reservoir of the main brake cylinder; 3, 7 - connecting sleeves; 4, 9 - connecting holes of pipelines; 5 - main brake cylinder; 6 - electrical connector of the brake fluid level sensor; 8 - piston pusher
The main brake cylinder 5 (Fig. 22) of the "tandem" type of hydraulic brake drive consists of two separate chambers connected to independent hydraulic circuits.
The first chamber is connected to the right front and left rear brake mechanisms, the second - to the left front and right rear brake mechanisms.
Tank 2 is installed on the main brake cylinder of Renault Sandero Stepway through rubber connecting bushings 3 and 7, the internal cavity of which is divided by a partition into two compartments. Each compartment feeds one of the master cylinder chambers.
When you press the brake pedal, the pistons of the master cylinder begin to move, the working edges of the cuffs block the compensation holes, the chambers and the reservoir are separated and the brake fluid is displaced.
A brake fluid level sensor is installed in the plug 1 of the tank. If the fluid level falls below the permissible level, the warning lamp for a malfunctioning brake system lights up in the instrument cluster.
Rice. 23. Vacuum brake booster Renault Sandero Stepway
1 - fork; 2 - locknut; 3 - pusher; 4 - protective cover; 5 - stud for fastening the vacuum booster; 6 - sealing gasket; 7 - amplifier case
The Renault Sandero Stepway vacuum brake booster (Fig. 23), installed between the pedal mechanism and the main brake cylinder, when braking due to rarefaction in the engine intake pipe through the rod and piston of the first chamber of the main cylinder, creates an additional force proportional to the force from the pedal.
A non-return valve is installed in the hose connecting the vacuum booster to the intake pipe. It holds the vacuum in the booster as it drops down the intake pipe and prevents the air-fuel mixture from entering the vacuum booster.
Rice. 24. Pressure regulator in the hydraulic drive of the rear brakes Renault Sandero Stepway
1 - pressure regulator housing; 2 - protective cover of the regulator rod; 3 - lever; 4 - adjusting nut; 5 - earring; 6 - fittings for connecting pipelines; 7 - regulator mounting eye
The pressure regulator changes the pressure in the hydraulic drive of the rear wheel brakes depending on the load on the rear axle of the vehicle. It is included in both circuits of the brake system, through it the brake fluid flows to both rear brake mechanisms.
The regulator is bolted to the body of the Renault Sandero Stepway. Its rod through a spring-loaded load rod, lever 3 (Fig. 24) and earring 5 is connected to the rear suspension beam.
Depending on the distance between the beam and the body, which depends on the vehicle load, the regulator stem moves, which, in turn, using a valve system, changes the cross-sectional area of the passage channels of the circuits inside the regulator, thereby limiting the pressure in the rear brake circuits.
The degree of limitation of the regulator, and consequently, the pressure in the circuits is regulated by changing the length of the regulator rod, with nut 4.
Rice. 25. Renault Sandero Stepway rear brake mechanism
1 - upper coupling spring; 2 - gap regulator; 3 - clearance adjuster lever; 4.11 - support posts; 5 - spring of the clearance adjuster lever; 6 - shield of the brake mechanism; 7 - front brake shoe; 8 - working cylinder; 9 - spacer bar; 10 - expanding lever of the parking brake drive; 12 - rear brake shoe; 13 - parking brake cable; 14 - lower coupling spring
The brake mechanism of a back wheel drum, with automatic adjustment of a backlash between pads and a drum. Brake pads 7 and 12 (Fig. 25) are driven by one hydraulic working cylinder 8 with two pistons. The optimal clearance between the drum and the shoes is maintained by a mechanical regulator 2 installed on the spacer bar 9.
The parking (manual) brake of the Renault Sandero Stepway, mechanically actuated, consists of a lever mounted on the base of the body between the front seats, a front cable with an adjusting device and an equalizer, to which two rear cables are connected and expanding levers installed in the brake mechanisms of the rear wheels .
The handbrake does not require special care. At the current inspection, check the condition of the drive cables. If a break in the shells or wires of the cables is detected, they must be replaced with new ones.
Renault Sandero Stepway ABS system
Anti-lock braking system (ABS) Renault Sandero Stepway consists of a hydro-electronic unit with hydraulic solenoid valves, wheel speed sensors, an electrically driven pump and a warning light in the instrument cluster.
ABS is used to regulate the pressure in the brake mechanisms of all wheels when braking in difficult road conditions, preventing the wheels from locking.
Renault Sandero Stepway ABS provides the following benefits:
Detour of obstacles with a higher degree of safety, including during emergency braking;
Reducing the braking distance during emergency braking while maintaining roadholding and vehicle controllability, including when cornering.
In the event of a system failure, a function to maintain operation in case of system failures is provided.
The hydroelectronic control unit receives information about vehicle speed, direction of travel and road conditions from wheel speed sensors.
Based on this information, the control unit determines the optimal wheel braking mode, changing the flow area of the circuits with the help of electromagnetic valves, anticipating the moment of blocking the wheel that slows down rotation, which prevents it from blocking.
If the system expects a wheel to lock up, it instructs the appropriate valve to isolate the fluid supply to that wheel's slave cylinder from the brake master cylinder.
If the wheel speed continues to decrease relative to the other wheels, the Renault Sandero Stepway ABS system returns the brake fluid back to the master cylinder, reducing braking.
If all four wheels decelerate equally, the return pump will shut off and all solenoid valves will open again, allowing the brake master cylinder to act on the slave cylinders normally. This cycle can repeat up to ten times per second.
The inclusion of solenoid valves and a return pump creates pulsations in the hydraulic drive of the brake system, they are transmitted to the brake pedal, thereby signaling to the driver that the Renault Sandero Stepway ABS is working.
Solenoid valves in the circuits of the brake mechanisms of the front wheels act on their working cylinders independently, on each separately, while the solenoid valve of the circuits of the brake mechanisms of the rear wheels acts on both working cylinders of the mechanisms simultaneously.
Because the brake system is diagonally split, a separate mechanical plunger valve in the hydraulic unit separates the hydraulic output of the rear solenoid valve into two separate circuits to prevent false signals from affecting the system, a built-in safety circuit monitors all signals to the control unit.
If a false signal is received or the voltage in the on-board electrical network is insufficient, the system is automatically turned off, the ABS deactivation warning lamp lights up in the instrument cluster.
In this case, the normal mode of operation of the brake system is maintained, however, when driving on a slippery road, you need to be extremely careful, since the distribution function of the system will be impaired (the function of equalizing the pressure in the brake mechanisms of the front and rear wheels) and there is a possibility of skidding the car when braking.
If there is a malfunction in the Renault Sandero Stepway ABS system, contact a service station, as special equipment is required to diagnose the malfunction and repair.
The hydraulic brake system is integrated into a single unit with metal tubes and hoses. The system is filled with a special brake fluid of at least DOT-4 class, which must be replaced periodically.
The off-road version of this model is known as the Sandero Stepway. Renault Sandero 1 generation was produced in 2008, 2009, 2010, 2011, 2012 and 2013. After, the car was updated and in 2014, 2015, 2016, 2017, 2018, 2019 and to the present, the 2nd generation Renault Sandero is being delivered. We provide information describing fuses and relays for Renault Sandero Stepway, their locations, photographs and block diagrams. We will provide a video example of replacing the cigarette lighter fuse.
Please note that the number of elements in the blocks may differ from those presented and depends on the degree of electrical equipment and the year of manufacture of the car.
Block in the salon
It is located at the end of the instrument panel.
Scheme
Decryption
| F01(20A) | Windshield wiper; rear window heating relay coil |
| F02(5A) | Power supply of the instrument cluster; winding relay K5 fuel pump and ignition coil; power supply of the ECU of the engine management system from the ignition switch |
| F03(20A) | Lamps of signals of braking; reversing lamps; windshield washer |
| F04(10A) | Circuits: airbag control unit; direction indicator lamps; diagnostic connector of the engine management system; immobilizer coils |
| F09(10A) | Chains: lamps of head light of the left block headlight (dipped beam); signaling device for switching on the dipped headlights in the instrument cluster; headlight washer pump |
| F10 (10A) | Headlight lamps of the right block headlight (dipped beam) |
| F11 (10A) | Headlight lamps of the left block headlight (high beam); signaling device for switching on the high beam headlights in the instrument cluster |
| F12 (10A) | Right Headlight Bulbs (High Beam) |
| F13 (30A) and F14 (30A) | Power window circuits for the rear and front doors, respectively |
| F15 (10A) | ABS ECU |
| F17 (15A) | Signal |
| F18 (10A) | Side light lamps of the left block headlight; lamps of dimensional light of the left back lantern; license plate lamps; illumination of the instrument cluster and controls on the instrument panel, console and lining of the floor tunnel; switch box buzzer |
| F19 (7.5A) | Side light lamps of the right block headlight; side light lamps of the right rear lamp; glove box lamps |
| F20 (7.5A) | Lamps and a signaling device of inclusion of a back antifog lantern |
| F21(5A) | Heated exterior mirror circuit |
| F28(15A) | Lamps of a plafond of illumination of salon; trunk light lamps; constant power supply of the head unit of sound reproduction |
| F29(15A) | Circuits: alarm switch; direction indicator switch; intermittent operation of the windshield wiper; central lock control; diagnostic socket of the engine management system |
| F30(20A) | Power circuit of the central lock |
| F31(15A) | Coil circuit relay K8 fog lights |
| F32(30A) | Heated rear window relay power circuit |
| F36(30A) | Power circuit relay K1 heater fan |
| F37(5A) | Circuits of electric drives of external rear-view mirrors |
| F38(10A) | cigarette lighter; power supply of the head unit of sound reproduction from the ignition switch |
| F39(30A) | Circuit winding relay K1 heater fan |
The fuse number 38 for 10A is responsible for the cigarette lighter.
Watch a video example of accessing the unit, as well as replacing the cigarette lighter fuse.
block under the hood
Scheme
Fuse designation
| F01(60A) | Circuits: power supply of the ignition lock and all consumers powered by the lock; outdoor lighting switch |
| F02(30A) | The power circuit of the relay K3 of the fan of the cooling system (on a car without air conditioning) |
| F03(25A) | Power circuits: relay K5 of the fuel pump and ignition coil; main relay K6 engine management system |
| F04(5A) | Circuits: constant power supply to the engine management computer; windings of the main relay K6 of the engine management system |
| F05(15A) | Not used |
| F06(60A) | Passenger compartment fuse box power circuit |
| F07(40A) | Power circuits: air conditioner relay K4; relay K3 low speed cooling fan (on a car with air conditioning); relay K2 high speed cooling fan (on a car with air conditioning) |
| F08 (50A) and F09 (25A) | ABS circuits |
Relay assignment
- K1 - stove fan relay, heater fan motor. See information about F36.
- K2 - high speed cooling fan relay (for cars with air conditioning), radiator cooling fan motor.
- Short circuit - low speed cooling fan relay (for cars with air conditioning) or radiator cooling fan relay (for cars without air conditioning), cooling fan motor (for cars with air conditioning - through a resistor).
- K4 - air conditioner relay, compressor electromagnetic clutch.
See information about F36. - K5 - fuel pump relay and ignition coil.
- K6 - the main relay of the engine management system, oxygen concentration sensor, speed sensor, fuel injectors, canister purge solenoid valve, relay windings K2, KZ, K4.
- K7 - headlight washer pump relay.
- K8 - fog lamp relay. See information about F31.
Renault Sandero 2
Block in the salon
It is located on the left side, under a protective cover.
Photo
Scheme
Purpose
| F1 | 30A power windows front |
| F2 | 10A high beam left headlight |
| F3 | 10A high beam right headlight |
| F4 | 10A low beam left headlight |
| F5 | 10A high beam right headlight |
| F6 | 5A rear dimensions, number plate illumination, illumination |
| F7 | 5A front dimensions |
| F8 | 30A rear power windows |
| F9 | 7.5A rear fog light |
| F10 | 15A horn |
| F11 | 20A central locking |
| F12 | 3A ABS/ESP |
| F13 | 10A interior lighting, air conditioning |
| F14 | 5A steering angle sensor |
| F15 | 15A windshield washer, parking radar, reversing light |
| F16 | 5A audio system, glass heating, speed limiter |
| F17 | 7.5A DRL |
| F18 | 7.5A stop signal |
| F19 | 5A control system |
| F20 | 5A airbag |
| F21 | reserve |
| F22 | reserve |
| F23 | reserve |
| F24 | 15A turn signal |
| F25 | 10A anti-theft system |
| F26 | 15A electrical control unit |
| F27 | 20A steering column switches (low beam input) |
| F28 | reserve |
| F29 | 25A steering column switches (high beam input) |
| F30 | reserve |
| F31 | 10A instrument panel |
| F32 | 7.5A audio system |
| F33 | 15A cigarette lighter |
| F34 | 15A diagnostic connector |
| F35 | 5A heated exterior mirrors |
| F36 | 5A mirror drive |
| F37 | 30A starter |
| F38 | 30A wiper |
| F39 | 40A air conditioner |
| R1 | 35A air conditioning relay |
| R2 | 35A rear defroster relay |
For the cigarette lighter, fuse 33 to 15A is responsible.
If you have an upgraded vehicle and the number of relays and fuses is different, check with.
block under the hood
It is located in the assembly compartment in the engine compartment.
Scheme
Designation
- Battery terminal
- A/C compressor diode
| Ef1 | 40A Right windshield heating element |
| Ef2 | 40A Left windshield heating element |
| Ef3 | 50A ABS/ESP |
| Ef4 | 60A Immobilizer, passenger compartment fuse supply circuit F28-F31 |
| Ef5 | 60A Supply of fuse circuits in the passenger compartment F11, F23 - F27, F34 and F39 |
| Ef6 | 30A ABS/ESP |
| Ef7 | 30A Heated rear window and mirrors |
| Ef8 | 15A Front fog lamps |
| Ef9 | 15A Seat heating |
| Ef10 | 15A Air conditioning clutch (equipment with air conditioning) / 25A First speed electric fan (equipment without air conditioning) |
| Ef11 | 25A Fuse for engine management relay |
| Ef12 | 40A Cooling fan |
| Ef13 | 15A Engine management system |
| Er1 | 35A Left glass heating relay |
| Er2 | 35A Right glass heating relay |
| Er3 | 20A Fuel pump relay |
| Er4 | 20A Relay for air conditioning compressor or electric fan first speed (depending on configuration) |
| Er5 | 35A Engine control relay |
Found a bug or want to ask something? Write everything in the comments.
Elements of the braking system of a car with an anti-lock braking system (ABS):
1 - floating bracket;
2 – front wheel brake hose;
3 – a disk of the brake mechanism of a forward wheel;
4 – a tube of the brake mechanism of a forward wheel;
5 – hydraulic drive reservoir;
6 - block ABS;
7 - vacuum brake booster;
8 - pedal assembly;
9 – brake pedal;
10 - rear parking brake cable;
11 – a tube of the brake mechanism of a back wheel;
12 – a hose of the brake mechanism of a back wheel;
13 - brake mechanism of the rear wheel;
14 – rear wheel brake drum;
15 – parking brake lever;
16 - sensor for signaling an insufficient level of brake fluid;
17 - the main brake cylinder
The working brake system is hydraulic, dual-circuit with diagonal separation of circuits. In normal mode (when the system is working), both circuits work. In case of failure (depressurization) of one of the circuits, the second one provides braking of the car, although with less efficiency.
The working brake system includes wheel brakes, pedal assembly, vacuum booster, brake master cylinder, hydraulic reservoir, rear wheel brake pressure regulator (only on vehicles without ABS), ABS unit, as well as connecting pipes and hoses.
Pedal assembly with vacuum booster and brake master cylinder:
1 - clutch pedal;
2 – the switch of signals of braking;
3 – pedal assembly bracket;
4 - vacuum brake booster;
5 - a reservoir of the hydraulic drive of the system;
6 - the main brake cylinder;
7 - brake pedal
Brake pedal - suspension type. A brake light switch is installed in the pedal assembly bracket in front of the brake pedal - its contacts close when the pedal is pressed.
The vacuum brake booster is located in the engine compartment between the pedal pusher and the main brake cylinder and is fastened with four nuts through the bulkhead to the pedal bracket. The vacuum booster is non-separable, in case of failure it is replaced.
The main brake cylinder is attached to the vacuum booster housing with two studs. On top of the cylinder there is a reservoir of the hydraulic drive of the brake system, in which there is a supply of fluid. The tank body is marked with maximum and minimum liquid levels, and a sensor is installed in the tank lid, which, when the liquid level drops below the MIN mark, turns on a signaling device in the instrument cluster.
When the brake pedal is pressed, the pistons of the master cylinder move, creating pressure in the hydraulic drive, which is supplied through pipes and hoses to the working cylinders of the wheel brakes.
Location of the pressure regulator in the hydraulic drive of the brake mechanisms of the rear wheels:
1 - rear suspension beam;
2 – hoses of brake mechanisms of back wheels;
3 – tubes of brake mechanisms of back wheels;
4 - pressure regulator;
5 - tubes for supplying brake fluid to the pressure regulator;
6 - regulator bracket;
7 - adjusting nut of the regulator stud;
8 – pressure lever;
9 - thrust adjusting sleeve;
10 - thrust
On a car without ABS, fluid for the rear wheel brakes is supplied through a pressure regulator located on the bottom of the body, between the rear suspension beam and the spare wheel stamping.
With an increase in the load on the rear axle of the car, the regulator rod connected to the rear suspension beam is loaded, transferring force through the pressure lever to the pin and then to the two regulator pistons.
Rear wheel brake pressure regulator parts:
1 – mud-protective cover;
2 - support sleeve;
3 - spring;
4 - pressure regulator pin;
5 - pressure regulator pistons;
6 - pressure regulator housing;
7 - thrust washer;
8 - guide sleeve
When the brake pedal is depressed, fluid pressure tends to push the pistons out of the regulator body, which is prevented (through a spring) by the force from the regulator rod. When the system comes into equilibrium, the valve located in the regulator shuts off the fluid supply to the wheel cylinders of the rear wheel brake mechanisms, preventing further growth of the braking force on the rear axle and preventing the rear wheels from locking ahead of the front wheels.
Rear wheel brake pressure regulator with levers:
1 - adjusting nut;
2 - plastic sleeve;
3 – pressure lever;
4 - regulator bracket;
5 - pressure regulator;
6 - draft regulator;
7 – thrust adjusting sleeve
With an increase in the load on the rear axle, when the grip of the rear wheels with the road improves, the regulator provides more fluid pressure in the wheel cylinders of the brake mechanisms of the rear wheels, and vice versa, with a decrease in the load on the rear axle (for example, when the car “pecks” during a sharp braking) the pressure decreases
ABS block:
1 - control unit;
2 - hole for connecting the tube of the brake mechanism of the front right wheel;
3 - hole for connecting the tube of the brake mechanism of the rear left wheel;
4 - hole for connecting the tube of the brake mechanism of the rear right wheel;
5 - hole for connecting the tube of the brake mechanism of the front left wheel;
6 – an opening for connection of a tube of the main brake cylinder;
7 - pump;
8 - hydraulic block
Some cars are equipped with an anti-lock braking system (ABS), which provides more efficient braking of the car by reducing fluid pressure in the brake mechanisms of the wheels at the time of their blocking. Prevents skidding and maintains controllability.
On a car with ABS, the fluid from the master brake cylinder enters the ABS unit, and from there it is supplied to the brake mechanisms of all wheels.
The ABS block, mounted in the engine compartment on the right side member, near the bulkhead, consists of a hydraulic unit, a modulator, a pump and a control unit.
Location of the front wheel speed sensor in the hub assembly:
1 - adjusting ring of the speed sensor;
2 – an internal ring of the bearing of a nave;
3 – wheel speed sensor;
4 - wheel hub;
5 - steering knuckle
ABS operates depending on the signals from the wheel speed sensors of the inductive type. The front wheel speed sensor is located in the wheel hub assembly - it is inserted into the groove of a special sensor mounting ring sandwiched between the end surface of the outer ring of the hub bearing and the shoulder of the steering knuckle hole for the bearing.
Front wheel speed sensor elements:
1 - protective washer of the bearing;
2 – speed sensor;
3 - hub bearing;
4 - adjusting ring of the speed sensor
The driving disk of the front wheel rotation speed sensor is the protective washer of the hub bearing, located on one of the two end surfaces of the bearing. This dark color puck is made of magnetic material. On the other end surface of the bearing there is an ordinary light-colored protective washer made of tin.
Arrangement of the driving disk of the gauge of speed of rotation of a back wheel:
1 – brake drum;
2 - setting disk of the speed sensor
The rear wheel speed sensor is fixed on the brake shield, and the sensor drive is a ring made of magnetic material pressed onto the shoulder of the brake drum.
Front 1 and rear 2 wheel speed sensors
When the vehicle is braked, the ABS control unit detects the start of a wheel lock and opens the corresponding modulator solenoid valve to release the pressure of the working fluid in the channel. The valve opens and closes several times per second, so you can verify that the ABS is working by the slight vibration of the brake pedal at the time of braking. In the event of a malfunction in the ABS, the brake system remains operational, but the wheels may lock. In this case, the corresponding fault code is written to the memory of the control unit, which is read using special equipment in the service center.
The brake mechanism of a forward wheel assy:
1 - screw securing the cylinder body to the caliper;
3 - bleed valve for hydraulic brakes;
4 – a bolt of fastening of a bracket to a directing finger;
5 - guide pin;
6 - shield of the brake mechanism;
7 – a disk of the brake mechanism;
8 – a cover of a directing finger;
9 - guide block;
10 - support;
11 - brake pads
The brake mechanism of the front wheel is disc, with a floating caliper, which includes a caliper and a single-piston wheel cylinder, held together by two screws. The brake mechanisms of the front wheels of cars with engines with a working volume of 1.4 liters and a volume of 1.6 liters are the same. Some cars are equipped with brake mechanisms with ventilated discs.
Front wheel brake elements:
1 – a bolt of fastening of a bracket to a directing finger;
2 – the case of the wheel cylinder;
3 – a protective cover of the piston;
4 - guide pin;
5 - protective cover of the guide pin;
6 - guide pads;
7 - support;
8 - piston
The brake pad guide is attached to the steering knuckle with two bolts, and the bracket is attached with two bolts to the guide pins installed in the holes of the guide pad. Protective rubber covers are installed on the fingers. The holes for the pins of the guide pads are filled with grease. The brake pads are pressed against the grooves of the guide by springs.
When braking, the fluid pressure in the hydraulic drive of the brake mechanism increases and the piston, moving out of the wheel cylinder, presses the inner brake pad against the disc. Then the bracket (due to the movement of the guide pins in the holes of the guide pads) moves relative to the disc, pressing the outer brake pad against it. A piston with a sealing rubber ring of rectangular section is installed in the cylinder body attached to the caliper. Due to the elasticity of this ring, a constant optimal gap is maintained between the disc and the brake pads.
Rear wheel brake with drum removed:
1 - rear brake shoe;
2 – spring cup;
3 – the lever of a drive of a parking brake;
4 - spacer bar;
6 – wheel cylinder;
7 – regulator lever;
8 - regulator spring;
9 - front block;
10 - shield;
11 – parking brake cable;
12 - lower coupling spring;
13 - support post
The brake mechanism of the rear wheel is drum, with a two-piston wheel cylinder and two brake shoes, with automatic adjustment of the gap between the shoes and the drum.
The brake mechanisms of the rear wheels of cars with engines with a working volume of 1.4 liters and a volume of 1.6 liters are the same.
The brake drum is integral with the rear wheel hub.
The automatic clearance adjustment mechanism consists of a composite pad spacer bar, a regulator lever and its spring. The automatic adjustment mechanism starts to work when the gap between the shoes and the brake drum increases.
Elements of the brake mechanism of the rear wheel:
1 - clamping spring pads;
2 – spring cup;
3 - rear block;
4 – the lever of a drive of a parking brake;
5 - upper coupling spring;
6 - spacer bar;
7 - lower coupling spring;
8 - regulator spring;
9 – regulator lever;
10 - front block;
11 - support post
When the brake pedal is pressed, under the action of the pistons of the wheel cylinder, the pads begin to diverge and press against the drum, while the protrusion of the regulator lever moves along the cavity between the teeth of the ratchet nut. With a certain amount of pad wear and the brake pedal depressed, the adjuster lever has enough travel to turn the ratchet nut one tooth, thereby increasing the length of the spacer bar and at the same time reducing the gap between the pads and the drum. Thus, the gradual lengthening of the spacer bar automatically maintains the clearance between the brake drum and the shoes.
The wheel cylinders of the brake mechanisms of the rear wheels are the same. The front pads of the brake mechanisms of the rear wheels are the same, while the rear ones are different - they are mirror-symmetrically installed non-removable levers of the parking brake drive.
Elements of the mechanism for automatic adjustment of the gap between the shoes and the drum:
a - the brake mechanism of the right wheel;
b - the brake mechanism of the left wheel;
1 – regulator lever;
2 - threaded tip of the spacer bar;
3 - ratchet nut;
4 - spring stopper;
5 - spacer bar
The spacer bar and the ratchet nut of the brake mechanism of the left wheel are silver (the ratchet nut and the end of the spacer bar have a right-hand thread), and the right wheel is golden (the ratchet nut and the end of the spacer bar have a left-hand thread). The levers of the regulators of the brake mechanisms of the left and right wheels are mirror-symmetrical. The right lever is marked "69" and the left - "68"
Parking brake elements:
1 - lever;
2 - front cable;
3 – cable equalizer;
4 - left rear cable;
5 - right rear cable;
6 – brake mechanism of the rear wheel;
7 - drum
Parking brake drive - manual, mechanical, cable, on the rear wheels. It consists of a lever, a front cable with an adjusting nut on its tip, an equalizer, two rear cables and levers in the rear wheel brakes.
The parking brake lever, fixed between the front seats on the floor tunnel, is connected to the front cable. An equalizer is attached to the rear tip of the front cable, into the holes of which the front tips of the rear cables are inserted. The rear tips of the cables are connected to the levers of the parking brake actuator, mounted on the rear shoes.
During operation (until the rear brake pads are completely worn out), adjustment of the parking brake drive is not required, since the lengthening of the brake mechanism spacer bar compensates for the wear of the pads. The parking brake actuator only needs to be adjusted if the brake pads, cables or parking brake lever have been replaced.
Renault Sandero owners periodically need to tighten the handbrake. This is due to the fact that with frequent use and gradual wear of the pads, the tensioned brake cable weakens. Today you will learn how to fix the problem with the "handbrake" in a couple of minutes, without resorting to the help of an auto mechanic and without spending a dime on it.
Preparation for work
Let's make a reservation right away: the procedure for tightening the brake cable on Renault Sandero does not take much time and requires a minimum of tools. The most important thing is to carefully dismantle the plastic parts and casings without accidentally damaging them. To carry out this simple procedure, we need:
- Key for 10;
- Flat screwdriver;
- Screwdriver "asterisk" type T20.
The wrench must be open-ended, since there will be very little room for “maneuvering” during work and it is necessary that the tool used be as compact as possible, which is clearly visible in the video. It is advisable to pre-wrap the screwdriver with tape or tape.
This tool is needed to pry the already fragile plastic parts, so it is important that the sharp metal edges do not scratch and break this soft material.
Before starting work, it is also necessary to free up space near the central tunnel: shift all things from cup holders and shelves, remove any protective covers, if any.
Particular attention should be paid to cleaning from dirt and dust: if foreign particles accidentally get inside the mechanism during disassembly, this can lead to its failure and improper operation.
main stage
If the tunnel is dismantled and the cable is tightened for the first time, it must be borne in mind that the plastic will be difficult to remove. This means that you will have to make some efforts, but not too much so as not to damage anything.
Work begins with the removal of the central tunnel. From the end, at the feet of the rear passengers, you need to find a protective cover of a rectangular shape. You can remove it by first prying it with a flat screwdriver. Under the cap is an asterisk bolt, which is easily unscrewed using the screwdriver prepared in the previous step.
By unscrewing the bolt, you can remove the tunnel itself. This is done in two stages. First, it must be moved back, parallel to the floor. In this case, the brake lever itself remains in place, and the shift will be made relative to it. With a second movement, the plastic casing rises and is laid aside.
Directly under the lever, on its lower side, there is a barely noticeable ledge made of black soft plastic. Pry it off with a flathead screwdriver and remove the cap to get to the brake cable tightening nut.
By screwing it in with an open-end wrench, you can ensure that the cable stops sagging and will actuate the rear pads faster. Without proceeding to the assembly, it is necessary to check each time when adjusting the bolt whether the handbrake works correctly. It is also not necessary to overdo it: excessive cable tension will lead to premature wear of the mechanisms and too much effort required to activate it.
Assembly is carried out in the reverse order of the described procedure. The main thing is not to tighten the mounting bolts too much, so as not to damage the plastic and break it.
What if it didn't help?
If the mechanism on your Renault is adjusted, but still refuses to work, the problem should be sought in the malfunction of the mechanism itself. Most often, the malfunction lies in the part of the mechanism that produces the mixing and breeding of the pads.
At the same time, the lever moves quite elastically, however, even when it is brought to the uppermost position, the car does not lock in place.
The second reason may be the wear of the rear pads. To check their condition, it is necessary to remove the rear wheel and conduct a visual inspection. If the pads are worn down to the indicator, they should be replaced and re-adjusted.
Conclusion
Adjusting the handbrake on Renault Sandero is a procedure that does not require much time and special tools. With a certain amount of knowledge, the adjustment takes only a few minutes and frees the owner from painful trips to the service, as well as guarantees trouble-free operation of the parking brake and confidence in his car.
