Warning: Check front wheel alignment, tire condition, and tire pressure before diagnosing brake problems. If there are malfunctions in the anti-lock braking system of the brakes, the system must be repaired at a service station.
Cause | Elimination Method |
Increased brake pedal free play | |
Worn brake pads | Replace brake pads. |
Faulty one of the circuits of the brake system | Check the tightness of the hydraulic circuits of the brake system. |
Increased travel and softness of the clutch pedal | |
There is air in the hydraulic brake system | Bleed the air from the hydraulic brake system. |
Low level of brake fluid in the reservoir | Top up the brake fluid level.
Bleed the air from the hydraulic brake system. |
Boiling of the brake fluid, which usually occurs when the brake system is heavily loaded | Change brake fluid. Bleed the air from the hydraulic brake system. |
Poor brake performance | |
Leaky hydraulic brake system | Locate and repair the leak in the hydraulic brake system. |
Damaged sealing ring in the main or working brake cylinder | Replace O-ring.
If the o-ring in the master cylinder is damaged, replace the inner parts of the master cylinder or the brake cylinder assembly. |
When you press the brake pedal, you need to apply a lot of force | |
Oil spilled on the brake pads | Replace brake pads. |
Incorrect brake pads installed | Replace brake pads. |
Faulty brake booster or leak in booster vacuum hose | Check the brake booster and the condition of the vacuum hose and replace if necessary. |
Worn brake pads | Replace brake pads. |
Vehicle pulls to one side when braking | |
Uneven tire pressure | Check and, if necessary, adjust the pressure in the tires of the wheels. |
Uneven tire wear | Replace worn tires |
Oil on the brake pads on one side of the car | Replace brake pads. |
Different sides of the car use brake pads with different friction material | Replace brake pads. |
Insufficient contact area between brake pads and brake disc | Replace brake pads. |
Caliper contamination | Clean the surfaces of the caliper mating with the brake pads. |
Full or partial jamming of the piston in the caliper | Replace caliper. |
Uneven wear of brake pads | Replace the brake pads and check the smoothness of the piston in the caliper. |
Constant braking of wheels | |
Compensation hole in brake master cylinder blocked | Clean and, if necessary, replace the internal parts of the brake master cylinder. |
Insufficient clearance between the pusher and the piston of the master cylinder | Check and, if necessary, adjust the gap between the pusher and the piston of the main brake cylinder. |
Brakes get hot while driving | |
Compensation hole in brake master cylinder blocked | Clean and, if necessary, replace the internal parts of the brake master cylinder. |
Insufficient clearance between the pusher and the piston of the master cylinder | Check and, if necessary, adjust the gap between the pusher and the piston of the main brake cylinder. |
Brake pads are constantly pressed against the brake disc | Check the operation of the brake caliper and replace it if necessary. |
Strong vibration when braking | |
Incorrect brake pads installed | Replace brake pads. |
There are traces of local corrosion on the brake disc | Mechanically process a working surface of a brake disk. |
Brake disc warp | Remake or replace the brake disc.
Brake pads are constantly pressed against the brake disc, while the wheel turns with difficulty |
There is corrosion in the brake caliper cylinders | Repair or replace the brake caliper. |
Uneven wear of brake pads | |
Incorrect brake pads installed | Replace brake pads. |
Brake caliper contamination | Clean the caliper. |
Piston stuck in caliper | Check the condition and, if necessary, replace the caliper. |
Leaky hydraulic brake system | Locate and repair leaks in the hydraulic brake system. |
Wedge-shaped wear of brake pads | |
The brake caliper is installed skewed in relation to the brake disc | Check the correct installation of the brake caliper. |
There is corrosion in the brake caliper | Clean off traces of caliper corrosion. |
Brake noise when braking | |
Completely worn out brake lining | Replace brake pads. |
There is a slight layer of rust on the brake discs | After a few decelerations, the noise should disappear and not appear again. |
Incorrect brake pads installed | Replace brake pads. |
The brake caliper is installed skewed in relation to the brake disc | Check the correct installation of the brake caliper. |
Brake caliper contamination | Clean the brake caliper. |
The appearance of strong vibration when braking on the brake pedal or steering wheel | |
Anti-lock braking system works under heavy braking | Repair is not required as this is normal. |
Severe wear or warping of the brake discs | Check the condition of the brake discs and replace them if necessary. |
Loose caliper bolts | Check and, if necessary, tighten the caliper mounting bolts. |
The ABS warning light comes on when the vehicle is moving | |
The voltage in the on-board network of the car is less than 10 V | Check the voltage in the car's onboard network. Check that the battery charging indicator lamp goes out after the engine is started.
Otherwise, check the condition of the V-belt and alternator. |
Faulty anti-lock brake system | Check the condition of the anti-lock brake system at a service station. |
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