Insufficient braking performance
Cause of malfunction | Elimination Method |
1. Leakage of brake fluid from the wheel cylinders of the front or rear brakes. | 1. Replace the bad parts of the wheel cylinders, wash and dry the pads and drums, bleed the brake drive. |
2. Air in the brake system. | 2. Remove air from the system. |
3. Damaged rubber seals in the main brake cylinder. | 3. Replace seals and bleed the system. |
4. The rubber hoses of the hydraulic drive system are damaged. | 4. Replace hoses. |
Spontaneous braking when the engine is running
Cause of malfunction | Elimination Method |
1. Air leakage in the vacuum booster between the valve body and the protective cap. | 1. Replace vacuum booster. |
Incomplete release of all wheels
Cause of malfunction | Elimination Method |
1. There is no free play of the brake pedal due to the wrong position of the brake light switch. | 1. Adjust switch position. |
2. The protrusion of the adjusting bolt of the vacuum booster relative to the mounting plane of the main cylinder exceeds 1.25-0,2 mm. | 2. Adjust the position of the adjusting bolt (rice. 6-2). |
3. Jamming of the valve body of the vacuum booster. | 3. Replace vacuum booster. |
4. The compensation hole in the master cylinder is clogged. | 4. Clean the hole and bleed the hydraulic drive system. |
5. Swelling of the rubber seals of the main cylinder due to the ingress of gasoline, mineral oils, etc. into the liquid. | 5. Thoroughly flush the entire system with brake fluid, replace damaged rubber parts, bleed the hydraulic drive system. |
6. Jamming of the piston of the main cylinder. | 6. Check and, if necessary, replace the master cylinder, bleed the drive system. |
Braking of one of the wheels with the brake pedal released
Cause of malfunction | Elimination Method |
1. The return spring of the rear brake pads is loose or broken. | 1. Replace spring. |
2. Seizure of the piston in the wheel cylinder due to corrosion. | 2. Disassemble the cylinder, clean and wash the parts, replace the damaged parts. |
3. Swelling of the sealing rings of the wheel cylinder due to the ingress of fuels and lubricants into the liquid. | 3. Replace the rings, flush the hydraulic drive system with brake fluid. |
4. No gap between pads and drum. | 4. Adjust the parking brake. |
5. Violation of the provision | 5. Tighten the mounting bolts, |
caliper relative to the brake disc when loosening the bolts securing the guide pads to the steering knuckle. | replace damaged parts if necessary. |
6. Increased brake disc runout (more than 0.15 mm). | 6. Grind the disc, if the thickness is less than 9 mm, replace the disc. |
Skidding or pulling the car to the side when braking
Cause of malfunction | Elimination Method |
1. Leakage of brake fluid in one of the wheel cylinders. | 1. Replace seals and bleed system. |
2. Jamming of the brake wheel cylinder piston. | 2. Check and eliminate jamming of the piston in the cylinder, if necessary, replace damaged parts. |
3. Blockage of any tube due to a dent or blockage. | 3. Replace the tube or clean it and bleed the system. |
4. Different tire pressure. | 4. Adjust the pressure. |
5. Incorrect wheel alignment. | 5. Adjust the corners. |
6. Dirty or oily discs, drums and linings. | 6. Clean the brake parts. |
7. Incorrect setting of the pressure regulator. | 7. Adjust its position. |
8. Defective pressure regulator. | 8. Adjust or replace. |
Increased pressure on the brake pedal
Cause of malfunction | Elimination Method |
1. Air filter clogged. | 1. Replace the air filter. |
2. Jamming of the valve body of the vacuum booster. | 2. Replace vacuum booster. |
3. The hose connecting the vacuum booster and the engine intake pipe is damaged, or its fastening on the fittings is loose. | 3. Replace the hose or tighten the hose clamps. |
4. Oxidation of the metal brake pedal bushings or drying of the grease in the pedal bushings. | 4. Replace worn parts or grease. |
Screeching or screeching brakes
Cause of malfunction | Elimination Method |
1. Weakening of the return spring of the rear brake pads. | 1. Check the return spring, replace if necessary. |
2. Ovality of the rear brake drums. | 2. Borrow drums. |
3. (Lubrication of friction linings. | 3. Scrub the pads with a wire brush using warm water and detergent. Eliminate the cause of fluid or grease getting on the brake pads. |
4. Wear of linings or the inclusion of foreign bodies in them. | 4. Replace pads. |
5. Excessive brake disc runout or uneven wear. | 5. Grind the disc, if the thickness is less than 9 mm - replace the disc. |