If one of the circuits of the working brake system fails, the braking efficiency of the front and rear wheels is halved.
Vacuum booster included in hydraulic drive (on vehicles with 4-cylinder engines) or hydraulic booster (on vehicles with 5-cylinder engines) and rear brake pressure regulator.
The cable operated mechanical parking brake acts on the rear wheels.
On vehicles with 4-cylinder engines, the front service brakes are disc, rear drum. On vehicles with 5-cylinder engines, the front and rear service brakes are disc.
Front wheel brakes
Girling or ATE front wheel brakes with solid (on vehicles with 4-cylinder engines) or ventilated (on vehicles with 5-cylinder engines) discs with floating brackets, single piston.
Characteristics of the brake discs of the front wheels
Brake pads
Friction lining thickness without backing, mm: 14.
Minimum friction lining thickness (when worn), mm: 2.
Brand and type of brake pads:
- brakes with solid discs Textar: T 461 or Pagid 511 FF;
- brakes with ventilated discs: Textar T 526 or Juried 526.
Rear wheel drum brakes
The brakes of the rear wheels are drum, with automatic adjustment of the gap between the pads and the drum.
From July 1987 on the version of the front wheel brakes with a two-piston caliper, pads with a retaining spring were installed. The pads of the new model can be used on all cars with brake calipers with two pistons.
Drum diameter, mm: 230.
Maximum permissible drum diameter, mm: 231.
Axial runout of the working surface of the drum, no more than, mm: 0.20.
The maximum admissible ovality of a drum, no more, mm: 0,10.
Friction lining thickness, mm: 5.25.
Minimum lining thickness (when worn), mm: 2.50.
Brand and type of friction linings: Textar T 062.
Wheel cylinder piston diameter, mm: 17.46.
Since January 1988, brake drums have been installed, the height of which is 6 mm higher than before.
Rear wheel disc brakes
Rear wheel brakes Girling, solid disc, floating caliper, single piston.
Characteristics of brake discs
Disc diameter, mm: 245.
Disc thickness, mm: 10.
Minimum disc thickness during operation, mm: 8.
Permissible difference in the thickness of the working surface of the disc, mm: 0.02.
Axial runout of the working surface of the disk, mm: 0.06.
Characteristics of brake pads
Friction lining thickness without backing, mm: 12.
Minimum friction lining thickness (when worn), mm: 2.
Substrate thickness, mm: 7.
Brand and type of brake pads: Juried 237 FF.
Starting with Chassis No. 44 JN 039013, vehicles with rear disc brakes were fitted with new calipers with a piston diameter of 38 mm.
Since January 1988, brake discs have been installed, the height of which is 6 mm higher than before.
Brake drive
Master brake cylinder
The main brake cylinder with two coaxial pistons brand Girling or ATE.
Diameter of the main brake cylinder, mm:
- for driving brakes with a vacuum booster: 22.20 or 23.81,
- for driving brakes with hydraulic booster: 23.81.
Brake Boosters
Vacuum booster brand Girling or ATE
Piston diameter: 9".
Hydraulic booster
The power brake booster system includes:
- high pressure piston pump common with power steering. Productivity at idle, l / min: 0.3;
- pressure accumulator with built-in non-return and safety valves. Pressure created in a new accumulator, kg/cm2 at a temperature of 20°С 88-92. Minimum pressure at 20°C, kg/cm2: 30.
- power brake booster brand ATE or Girling with a piston diameter of 24 mm.
Pressure regulator
The pressure regulator regulates the pressure in the hydraulic drive of the rear wheel brakes depending on the load on the rear axle of the vehicle.
Data for pressure regulator tightness test
Brake fluid pressure in the left front brake caliper, kg/cm2: 100.
Permissible brake fluid pressure drop in 5 s in the wheel cylinder or in the left rear brake caliper, kg/cm2: 10.
Regulated pressure test data
Brake fluid pressure in the left front brake caliper, kg/cm2: 50; brake fluid pressure in the wheel cylinder or caliper of the right rear wheel, kg/cm2: 32.5-42.5.
Brake fluid pressure in the left front brake caliper, kg/cm2: 100; brake fluid pressure in the wheel cylinder or caliper of the right rear wheel, kg/cm2: 50.0-71.5.
Parking brake
Parking brake with cable drive on the rear wheels.
Brake fluid
Capacity of the brake hydraulic drive system, l: 0.5.
The brake fluid used is DOT3 or DOT4 brake fluid.
Anti-Lock Braking System (ABS)
Brand: Bosch.
Catalog no.:
- electronic control unit: 0 285 201 005;
- rotation speed sensors: 0 285 001 006;
- hydraulic block: 0 285 201 003.
High and low pressure test data
Brake fluid pressure in the front wheel caliper, kg/cm2: 100.
Permissible brake fluid pressure drop in 45 s, kg/cm2: 4.
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