Cause | Elimination Method |
Too much idling brake pedal | |
One brake circuit failed | Check the tightness of the brake circuits |
The brake pedal is depressed far and springy | |
Air in the brake system | Release air from the brake system |
Too little brake fluid in expansion tank | Add new brake fluid, bleed air |
The formation of bubbles occurs most often as a result of a strong load, for example, descents in the mountains | Change brake fluid, bleed air |
The braking effect is reduced, the brake pedal is fully depressed | |
Leaky pipeline | Tighten piping connections or replace piping |
The cuff of the main or brake cylinder of the wheel is damaged | Replace the cuff, replace the internal parts of the master brake cylinder, if necessary, replace the master brake cylinder |
Specially for disc brake: damaged stationary rubber sealing ring | To sort out the brake mechanism |
Poor braking effect in spite of strong pressure on the brake pedal | |
Oiled brake pads | Replace brake pads |
Unsuitable or hardened brake linings | Replace brake pads, install VW brake pads |
Faulty brake booster | Check brake booster |
Especially for disc brakes: worn brake pads | Replace brake pads |
When braking, the car pulls to the side | |
Tire pressure not correct | Check and adjust tire pressure |
Tires worn unevenly | Replace worn tires |
Oiled brake pads | Replace brake pads |
Brake linings of various types on one axle | Replace brake pads. Install VW brake pads |
Bad brake pad contact patch | Replace brake pads |
Especially for disc brakes: dirty brake shafts (saddles or frames) | Clean the mounting points and guide surfaces in the brake mechanism |
Corrosion in brake cylinders | Replace brake mechanisms |
Uneven brake pad wear | Replace brake pads (on both wheels) |
Especially for drum brakes: heavy piston stroke in the brake cylinder | Repair brake cylinder |
The brake works by itself | |
The compensation hole of the main brake cylinder is clogged | Clean the master brake cylinder, replace the internal parts at the service station |
The gap between the working draft and the piston of the main brake cylinder is too small | Check clearance |
Brakes get hot while driving | |
The compensation hole of the main brake cylinder is clogged | Clean the master brake cylinder, replace the internal parts at the service station |
The gap between the working draft and the piston of the main brake cylinder is too small | Check clearance |
Special for disc brakes: Throttle port of the special support valve is clogged | Clean the brake master cylinder, replace the internal parts and change the brake fluid |
Especially for drum brakes: brake shoe return springs weakened | Replace return springs |
The brakes are rattling | |
Brake pads do not match the above | Replace brake pads, install VW brake pads |
Disc brake specific: disc brakes corroded in places | Carefully level the disc with a grinding stone |
Lateral battle of the brake disc | Repair or replace brake disc |
Especially for drum brakes: worn brake linings | Replace brake pads, install VW brake pads |
Brake drum not round | Turn, if necessary, replace the brake drum |
Brake pads do not move away from the brake disc, the wheels turn tightly by hand | |
Especially for disc brakes: corrosion in brake cylinders | To sort out the brake mechanism, replace |
Uneven brake pad wear | |
Specifically for disc brakes: brake pads do not comply with the above | Replace brake pads, install VW brake pads |
Dirty brake | Clean brake surfaces |
Difficulty moving pistons | Restore ease of piston stroke |
Leaky brake system | Check the tightness of the brake system |
Tapered brake pad wear | |
Especially for disc brakes: the brake disc does not rotate parallel to the brake mechanism | Check brake contact surface |
Corrosion in the brake mechanism | Eliminate pollution |
Pistons don't work well | Check piston adjustment (piston ring) |
Brakes squeak | |
Environmental influence (air humidity) | No need to eliminate (if the creak appears after the car has been standing for a long time in high humidity, but then disappears after the first braking) |
Specifically for disc brakes: brake pads do not match | Replace brake pads, install VW brake pads |
Brake disc not parallel to brake mechanism | Check brake contact surface |
Mines in the brake mechanism are dirty | Clean the brake shafts |
Bent brake pad springs | Replace retaining springs |
Stretch springs extended | Pull out the springs |
Especially for drum brakes: brake pads do not fit snugly | Replace brake pads |
Dirty brakes | clean the brakes |
Return springs too loose | Replace return springs |
Brakes are throbbing | |
ABS works | Elimination does not require |
Special for disc brake: lateral battle or brake disc thickness tolerance too large | Check the battle and tolerance, bring the disk to normal or replace |
Brake disc not parallel to brake mechanism | Check the contact surface of the thermos mechanism |
Especially for drum brakes: contact surface of the disc on the brake drum is uneven, bending of the brake drum | Try swapping disks with each other; it is better to grind the brake drum together with the wheel screwed to it on a lathe |
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