Contents: Front wheel brakes ⇓ Rear wheel drum brakes ⇓ Rear wheel disc brakes ⇓ Brake drive ⇓ Parking brake system ⇓ Brake fluid ⇓ Tightening torques of main threaded…⇓
The vehicles use a service brake system with diagonally divided circuits. One hydraulic drive circuit ensures the operation of the right front and left rear brake mechanisms, the other - the left front and right rear.
The brake drive is hydraulic, from the pedal and the main brake cylinder with two coaxial pistons, with a vacuum booster and a dual-circuit pressure regulator for the rear brakes.
On all models, except for cars with B6 and B6 EGI engines, the front service brakes are disc brakes, and the rear ones are drum brakes. On cars with B6 and B6 EGI engines, the front and rear service brakes are disc brakes.
The parking brake is mechanical, cable-operated and driven by the rear wheel brake mechanisms.
Front wheel brakes
Front wheel brakes with ventilated discs, floating calipers, single-piston.
Brake calipers
Piston diameter, mm:
- on models produced before 1988: 50.8;
- on models produced since 1988: 51.1.
Brake disc
Disc diameter, mm:
- on models produced before 1988: 260;
- on models produced since 1988:
- for wheel rims with a seat diameter of 13": 238;
- for wheel rims with a seat diameter of 14": 260.
Disc thickness, mm: 18.
Minimum disc thickness during operation, mm: 16.
Axial runout of the working surface of the disk, no more than, mm: 0.1.
Brake pads
Friction lining thickness, mm: 10.
Minimum friction lining thickness (when worn out), mm:
- on models produced before 1988: 1;
- on models produced since 1988: 2.
Brand and type of brake pads: Sumitomo JBKC 80 FE 7F 501.
Spare parts include brake pads with an audible indicator of friction lining wear, which is a plate attached to the pad support that begins to rub against the brake disc when the lining thickness decreases to 2 mm or less.
Brake shoe with audible wear indicator of the friction lining: 1 - pad support; 2 - sound indicator of lining wear.
Rear wheel drum brakes
The rear wheel brakes are drum-type, with automatic adjustment of the gap between the pads and the drum.
Wheel cylinders
Piston diameter, mm: 17.50.
Brake drums
Nominal drum diameter, mm:
- sedans: 200.0;
- station wagons: 228.6.
Increase in drum diameter after boring and grinding, no more than, mm:
- sedans: 201.0;
- station wagons: 229.6.
Brake pads
Width and length of friction lining, mm:
- sedans: 25x191.9;
- station wagons: 25x219.5.
Friction lining thickness, mm: 5.
Minimum friction lining thickness (when worn out), mm: 1.
Brand and type of friction linings: JB NU 60.
Rear wheel disc brakes
Rear wheel brakes with solid discs, floating calipers, single-piston.
Brake calipers
Piston diameter, mm: 30.2.
Brake discs
Disc diameter, mm: 247.
Disc thickness, mm: 10.
Minimum disc thickness during operation, mm: 9.
Axial runout of the working surface of the disk, no more than, mm: 0.1.
Brake pads
Friction lining thickness, mm: 8.
Minimum friction lining thickness (when worn out), mm: 1.
Friction lining brand: Mazda.
Brake drive
Master brake cylinder
Master brake cylinder with sequential piston arrangement.
Nominal diameter of the main brake cylinder, mm: 22.22.
Vacuum booster
Piston diameter, mm:
- all models except cars with B6, B6 EGI engines: 177.7 (7");
- models with engines B6, B6 EGI: 203.1 (8");
- station wagons produced since 1989: 213.
Pressure regulator
The pressure regulator regulates the pressure in the hydraulic drive of the rear wheel brake mechanisms depending on the load on the rear axle of the car. It is included in both circuits of the brake system, and through it the brake fluid is supplied to both rear brake mechanisms.
Data for checking the pressure regulator
Parking brake system
The parking brake is mechanical, lever-cable type, and acts on the brake drums or discs of the rear wheel brake mechanisms.
When the parking system is adjusted correctly, the lever should move:
- on cars produced before 1988:
- with drum brakes: 7-11 teeth sector;
- with disc brakes: 9-15 teeth sector;
- on cars produced since 1988: 5-7 teeth of the sector.
Brake fluid
The brake fluid used: according to FMV 55 116 D0T3 or D0T4 standards.
Frequency of checking the brake fluid level: every 15,000 km or every year of operation.
Frequency of brake fluid replacement: every 30,000 km or every two years of operation.
Tightening torques of main threaded connections, kgf·m
- Front brake caliper mounting bolt to steering knuckle: 5.0-6.0.
- Bolt securing upper guide pin to front brake caliper: 1.6-2.5.
- Bolt securing lower guide pin to front brake caliper: 2.0-3.0.
- Rear brake shoe guide mounting bolt: 5.0-7.0.
- Bolt for fastening the lower guide pin of the rear wheel disc brake mechanism: 1.6-2.4.
- Bolt for fastening the rear drum brake shield to the hub journal: 8.0-11.9.
- Bolt for fastening the working cylinder to the brake shield: 1.0-1.3.
- Nut securing the master cylinder to the vacuum booster: 1.9-2.6.
- Nut for fastening the vacuum booster to the bracket: 1.0-1.6.
- Hub nut: 1.3-2.2.
- Wheel mounting nut: 9.0-12.0.