Malfunction | Possible cause |
Malfunctions that appear on the brake pedal | |
Hard pedal:increased force on the brake pedal with a noticeable decrease in braking efficiency | Vacuum booster is faulty Adjustments and brake pads:
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Seizure of pistons in wheel cylinders | |
Blockage of any pipeline due to a dent | |
Soft pedal 1.When the vehicle is moving. 2.When the vehicle is stationary and the engine is not running. Additional test to check the pedal travel: Before evaluating the test results, press the brake pedal five times to eliminate the influence of the vacuum booster | Presence of air in the brake system: incomplete removal of air from the system |
Fluid leakage through hydraulic drive element seals | |
Lack of fluid in the tank (fluid leaking from connections) | |
Increased brake pedal travel. The check must be carried out on a stationary vehicle with the engine not running. Note: Before evaluating the test results, press the brake pedal five times to eliminate the influence of the brake booster | Incorrect adjustment of the clearance between the brake shoes and the drum. Disc and drum brake mechanisms: brake mechanisms with automatic adjustment of the clearance between the brake shoes and drums - the parking brake cable is overtightened. Automatic adjustment of brake mechanisms with automatic adjustment of the clearance between the brake shoes and drums is performed by the brake pedal, if the parking brake cable is normally tightened with the parking brake lever in the extreme lower position |
Significantly uneven wear of brake pads (the surface of the pads is stepped or concave) | |
Increased clearance between the pushrod and the piston of the master brake cylinder | |
Boiling or overheating of brake fluid | |
The brake pedal drops to the floor when pressed lightly.The test must be carried out with the vehicle stationary and the engine off. Note: Before evaluating the test results, press the brake pedal five times to eliminate the influence of the brake booster | Liquid leak (check the seals) |
Damage to the seal between the two circuits of the master brake cylinder | |
Boiling of liquid | |
Malfunctions on the road | |
Braking the wheels of a car while it is moving | Adjust the brake pads to fit |
The brake pads are slightly oily | |
The tension springs need to be replaced | |
Squeaking or vibration of brake mechanisms | Ovality of brake drums |
Increased runout of brake discs | |
Uneven wear of brake discs | |
Presence of deposits on brake discs (oxidation between the pads and the disc) | |
Car pulls away when braking (front wheels) | The front suspension and steering need to be checked |
Seizure of the working cylinder piston (On vehicles with negative wheel alignment, the vehicle pulling to one side is the result of a fault in the circuit on the opposite side) Tires (wear, air pressure) Brake line blockage due to denting | |
Skidding when braking (rear wheels) | Brake force regulator (misalignment or malfunction) |
Seizure of the working cylinder piston | |
Incorrect adjustment of the clearance between the brake shoes and the drum | |
Tension springs | |
Overheating of brake mechanisms | Insufficient clearance between the pushrod and the piston of the master brake cylinder, which does not allow it to return to its original position |
Seizure or jamming of pistons in working cylinders | |
Brake line blockage due to denting | |
The parking brake system drive lever is stuck | |
Incorrect adjustment of the parking brake system |
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