12:17. Diagnostics of malfunctions of the brake system

Before coming to conclusion about failure of the brake system check a state and pressure of a rating of tires and uniformity of loading of the car (see the Head Routine maintenance of the car). Besides, check correctness of angles of installation of wheels (see the Head Steering).


Symptom Possible reason
When braking course stability of the car is broken Tires are pumped incorrectly up (see the Head Routine maintenance of the car).
Adjustment of angles of installation of wheels is broken (see the Head Steering).
On one axis tires of various standard size are installed.
Passability of brake lines or hoses is broken (see the Head the Brake system).
The support of the brake mechanism is damaged (see the Head the Brake system).
Fastening of components of a suspension bracket weakened (see the Head the Forward suspension bracket).
Fastening of a support of the brake mechanism weakened (see the Head the Brake system).
During braking there are extraneous noises (a gnash or high-frequency squeal) Frictional overlays of brake shoes of lobbies or back brake mechanisms are worn-out to substrate metal. Squeal is published by indicators of wear of blocks at friction about brake disks. Immediately replace blocks (see the Head the Brake system).
Brake vibration takes place. (pedal pulsations)

On the models equipped with ABS of a pulsation of a pedal of a brake are a consequence of normal functioning of system

The excessive cross beating of a brake disk takes place (see the Head the Brake system).
Parallelism of walls of a brake disk is broken above an admissible limit (see the Head the Brake system).
Uneven wear of brake shoes owing to jamming of a support as a result of the wrong installation of a gap or hit of dirt takes place (see the Head the Brake system).
The brake disk is faulty (see the Head the Brake system).
The course of a brake pedal is excessively big Partial violation of functioning of the brake system takes place (see the Head the Brake system).
Level of brake fluid fell in GTTs (see Chapters Routine maintenance of the car and the Brake system).
Air got to hydraulic system (see Chapters Routine maintenance of the car and the Brake system).
The stop of the car requires applying of excessively big effort to a brake pedal The block of the vacuum amplifier of brakes is faulty (see the Head the Brake system).
Partial violation of functioning of the brake system takes place (see the Head the Brake system).
Brake blocks / boots are excessively worn-out (see the Head the Brake system).
The piston (i) of a support is jammed (see the Head the Brake system).
Frictional overlays of brake shoes are greasy (see the Head the Brake system).
Are established and yet new brake shoes were not earned extra - for extra earnings of blocks to disks time is required.
Brakes "are taken" There is no due return of GTTs pistons (see the Head the Brake system).
Passability of brake lines / hoses is broken (see Chapters Routine maintenance of the car and the Brake system).
Adjustment of the parking brake is broken (see the Head the Brake system).
Functioning of the mechanism of automatic adjustment of drum back brake mechanisms (is broken at the corresponding complete set) (see the Head the Brake system).
Uniformity of distribution of brake effort is broken The vacuum amplifier of brakes is faulty (see the Head the Brake system).
The mechanism of a pedal of a foot brake is jammed (see the Head the Brake system).
Softness of the course of a brake pedal at its squeezing takes place Air got to hydraulic system (see the Head the Brake system).
Bolts of fastening of GTTs weakened (see the Head the Brake system).
GTTs is faulty (see the Head the Brake system).
The brake pedal fails to a floor practically without resistance Excessively liquid level fell in the GTTs tank owing to leaks via the piston (i) of supports, weakening of fastening or damage of hydraulic brake lines (see the Head the Brake system).
The parking brake does not provide reliable fixing of the car Adjustment of the parking brake is broken (see the Head the Brake system).
Are worn-out, or frictional overlays of boots of the mechanism of the parking brake are polluted (see the Head the Brake system).