Brake system with ABS and ASR
1. RPM sensor; 2. Hydraulic unit; 3. Front brake mechanism; 4. Master brake cylinder; 5. Brake booster; 6. Parking brake cable; 7. Parking brake drums; 8. Rear brake discs
The foot operated hydraulic brake system consists of a brake master cylinder, power brake booster and front and rear wheel disc brakes. The braking system has two circuits. One of the circuits covers the front wheels, the second - the rear. If one of the circuits fails, for example, due to leakage, the vehicle can be braked using only the second circuit. The pressure in both circuits is created in the dual brake master cylinder by pressing the brake pedal.
The brake fluid reservoir is located above the brake master cylinder and supplies brake fluid to the entire system.
The hydraulic brake booster accumulates part of the suction vacuum received by the engine. Since a diesel engine does not generate sufficient suction vacuum, diesel models have a special vacuum pump for the brake system. In this case, the vacuum is transmitted to the brakes through the corresponding valve.
The front disc brakes are equipped with a floating caliper disc mechanism. In this case, only one piston is needed to press both brake linings against the brake disc. The rear axle has fixed caliper brakes that provide the required deceleration. Two pistons are required to press the brake linings in the case of a mechanism with fixed calipers.
The parking brake is cable operated and only applies to the rear wheels. Since disc brakes are not very suitable as parking brakes, two brake drums are additionally placed on the rear wheels, built into the brake discs. Brake drums are used exclusively for parking.
When cleaning the brake device, wear lining dust flies, which is harmful to health. Therefore, when cleaning the brakes, be careful not to inhale brake wear products. Brake linings are an integral part "Permits to operate the car in these conditions", in addition, they differ depending on the model. It is recommended to use only branded brake pads.
Note: After installing new linings, they must be run in. During break-in (about 200 km) Avoid unnecessarily sudden braking.
Working on the brake system requires thorough cleanliness and precise adherence to technology. If there is no experience, contact the workshop.
Attention! If during braking, especially when cornering, a different pedal travel is felt, then the brake discs should be checked for lateral runout on the outer diameter. Excessive lateral runout can be caused by excessive bearing play. Therefore, first check this play and, if necessary, install it. If there is no improvement after this, replace the brake disc.