7.19. Diagnostics of malfunctions of brakes
|
REASON
|
ELIMINATION METHOD
|
|
Too big idling of a pedal of a brake
| |
| One brake contour failed |
To check tightness of brake contours
|
|
The pedal of a brake is squeezed out far and пружинисто
| |
| Air in the brake system |
To let out the air from the brake system
|
| Too little brake fluid in a broad tank |
To add new brake fluid, to let out the air
|
| Formation of bubbles is caused most often by strong loading, for example, descents in mountains |
To replace brake fluid, to let out the air
|
|
The brake effect decreases, the pedal of a brake is squeezed out up to the end
| |
| The pipeline is untight |
To tighten connections of pipelines or to replace the pipeline
|
| The cuff of the main or brake cylinder of a wheel is damaged |
To replace a cuff, at the main brake cylinder to replace internal parts, if necessary, to replace the main brake cylinder
|
| Especially for a disk brake: the stationary rubber sealing ring is damaged |
To touch the brake mechanism
|
|
Bad brake effect contrary to strong pressing a brake pedal
| |
| Brake slips are greasy |
To replace brake slips
|
| The improper or hardened brake slips |
To replace brake slips, to establish brake overlays of VW
|
| The amplifier of brakes is faulty |
To check the amplifier of brakes
|
| Especially for disk brakes: brake slips are worn-out |
To replace brake slips
|
|
When braking pulls the car aside
| |
| Pressure in tires is not normal |
To check and adjust pressure in tires
|
| Tires are worn-out unevenly |
To replace worn-out tires
|
| Brake slips are greasy |
To replace brake slips
|
| Brake overlays of various type on one bridge |
To replace brake slips. To establish brake overlays of VW
|
| Bad spot of contact of brake slips |
To replace brake slips
|
| Especially for disk brakes: mines of brake mechanisms (saddles or frames) are polluted |
To clean installation sites and the directing surfaces in the brake mechanism
|
| Corrosion in cylinders of brake mechanisms |
To replace brake mechanisms
|
| Uneven wear of brake slips |
To replace brake slips (on both wheels)
|
| Especially for a drum brake: a heavy piston stroke in the brake cylinder |
To restore the brake cylinder
|
|
The brake works in itself
| |
| The compensation opening of the main brake cylinder is hammered |
To clean the main brake cylinder, to replace internal parts with HUNDRED
|
| The gap between working draft and the piston of the main brake cylinder is too small |
To check a gap
|
|
Brakes heat up during the movement
| |
| The compensation opening of the main brake cylinder is hammered |
To clean the main brake cylinder, to replace internal details with HUNDRED
|
| The gap between working draft and the piston of the main brake cylinder is too small |
To check a gap
|
| Especially for disk brakes: the throttle opening of the special basic valve is hammered |
To clean the main brake cylinder, to replace internal parts and to replace brake fluid
|
| Especially for a drum brake: returnable springs of brake shoes weakened |
To replace returnable springs
|
|
Brakes roar
| |
| Brake slips do not correspond the above |
To replace brake slips, to establish brake overlays of VW
|
| Especially for a disk brake: disk brakes in places zakorrodirovat |
To carefully level a disk a grinding stone
|
| Side fight of a brake disk |
To finish or replace a brake disk
|
| Especially for a drum brake: brake slips are worn-out |
To replace brake slips, to establish brake overlays of VW
|
| Brake drum not of a round form |
To pierce, if necessary to replace the brake drum
|
|
Brake slips do not depart from a brake disk, wheels hardly rotate by hand
| |
| Especially for a disk brake: corrosion in cylinders of brake mechanisms |
To touch the brake mechanism, to replace
|
|
Uneven wear of brake slips
| |
| Especially for disk brakes: brake slips do not correspond the above |
To replace brake slips, to establish brake overlays of VW
|
| The brake mechanism is polluted |
To clean the surfaces of the brake mechanism
|
| The course of pistons is complicated |
To restore ease of the course of pistons
|
| The brake system is untight |
To check tightness of the brake system
|
|
Cone-shaped wear of brake slips
| |
| Especially for a disk brake: the brake disk rotates not parallel to the brake mechanism |
To check a surface of a prileganiye of the brake mechanism
|
| Corrosion in the brake mechanism |
To eliminate pollution
|
| Badly pistons work |
To check adjustment of pistons (a piston ring)
|
|
Brakes creak
| |
| Influence of the environment (humidity of air) |
There is no need to eliminate (if the scratch appears after long standing of the car at strong humidity of air, but then disappears after the first braking)
|
| Specially plant louses of a disk brake: brake slips do not correspond |
To replace brake slips, to establish brake overlays of VW
|
| The brake disk is nonparallel to the brake mechanism |
To check a surface of a prileganiye of the brake mechanism
|
| Mines in the brake mechanism are polluted |
To clean mines of the brake mechanism
|
| Lock springs of brake shoes are bent |
To replace lock springs
|
| Expansion springs are extended |
To extend expansion springs
|
| Especially for a drum brake: brake slips adjoin leaky |
To replace brake slips
|
| Brakes are polluted |
To clean brakes
|
| Returnable springs are too weakened |
To replace returnable springs
|
|
Brakes pulse
| |
| ABS works |
Does not demand elimination
|
| Especially for a disk brake: side fight or is too big the admission of thickness of a brake disk |
To check fight and the admission, to bring a disk to norm or to replace
|
| The brake disk is not parallel to the brake mechanism |
To check a surface of a prileganiye of the thermos mechanism
|
| Especially for a drum brake: a disk prileganiye surface to the brake drum uneven, a bend of the brake drum |
To try to change disks among themselves; it is better to pierce the brake drum together with the wheel screwed on it on turning
|