Technical data
Data | Meaning |
Master brake cylinder | |
| tandem |
| |
| 22,22 |
| 23,81 |
Vacuum brake booster | |
| Vacuum |
| |
| 228,6 |
| 177,8–203,2 |
| |
| 5,5:1 |
| 6,0:1 |
pressure limiter | 4DR 5DR |
| 2,55 3,9 |
| 0,27:1 0,32:1 |
Front brakes | |
| Disc, ventilated |
| 257 |
| 24 |
| 11 |
| 54 |
Rear disc brakes | |
| 258 |
| 10 |
| 9 |
Rear drum brakes | |
| 203,2 |
| 9,4 |
| 405 |
Parking brake | Mechanical, acting on the rear wheels |
Anti-Lock Braking System
Data | Meaning |
ECU control unit | |
| 10–16 |
| –40…110 |
Control lamp: ABS, EBD | |
| 12 |
| 80 |
Wheel speed sensor | |
| 1275–1495 |
| 15–2000 |
| 0,15 |
| 0,2–1,2 |
Hydraulic unit HECU | |
| 2,5 |
| 12 V, 30 A |
| 180 |
| 5,5 |
Adjustment data
Data | Meaning |
Height of installation of a pedal of a brake, mm | 170 |
Brake pedal travel, mm | 128 |
Stoplight switch gap, mm | 0,5–1,0 |
Free travel of the brake pedal, mm | 3–8 |
Clearance between the pusher of the vacuum brake booster and the main brake cylinder, mm | 0 |
Travel of the parking brake lever when tightening it with a force of 196 N | 8 clicks |
The minimum allowable thickness of the front brake pads, mm | 2 |
The minimum allowable thickness of the brake disc, mm | 22,4 |
Minimum allowable thickness of rear brake pads (drum brake), mm | 1 |
The maximum allowable bore diameter of the brake drum, mm | 205,2 |
Minimum allowable rear brake disc thickness, mm | 8 |
Tightening torques, Nm
Data | Meaning |
Nuts of fastening of the main brake cylinder to an arm | 8–12 |
Nuts of fastening of an arm of the main brake cylinder | 13–16 |
Vacuum hose fitting to air expansion chamber | 15–18 |
bleed valve | 7–9 |
Connecting nuts for brake pipes | 13–17 |
Caliper Guide Pin Bolt | 22–32 |
Bolts of fastening of a support to a rotary fist | 65–75 |
Hollow bolt of fastening of a brake hose to a forward support | 25–30 |
Bolts of fastening of the working brake cylinder | 12–18 |
Front wheel speed sensor | 8,2–9,7 |
Rear wheel speed sensor | 8,2–9,7 |
Bolts of fastening of the block of management and the hydraulic block HECU | 8–10 |
Bolts of fastening of brackets of the control unit ECU and hydraulic unit HECU | 9–10 |
Six brake pipes to the hydraulic unit | 13–17 |
Warning! When installing, new self-locking nuts must be used.
General information
The vehicles use a hydraulically actuated service brake system.
The system works like this:
- the brake pedal is connected to the master brake cylinder;
- when the pedal is pressed, fluid under pressure from the brake master cylinder is transferred through metal tubes and flexible hoses to the front and rear brakes;
- working brake cylinders are hydraulic modulators that convert the fluid pressure created in the main brake cylinder into movement of the elements of the brake mechanism;
- the front and rear pistons of the brake caliper move and, due to friction on the brake discs and drums, provide the required deceleration of the car;
- when the brake pedal is released, the pressure in the system decreases.
The brake pads and pistons return to their neutral or rest position and braking stops.
When the brake fluid level decreases, the fluid level sensor in the master brake cylinder turns on a warning lamp in the instrument cluster. If the warning lamp is on, first of all, check that the parking brake is released, as the lamp indicates a low fluid level and a tightened parking brake.