9.1. Possible malfunctions of brake systems and ways of their elimination

Possible malfunctions of brake systems and ways of their elimination
Cause of defect
Way of elimination
The increased brake pedal course
Availability of air in system of a hydraulic actuator
To pump over system
The persistent ring of the piston of the back wheel cylinder lost elasticity and under the influence of a coupling spring of blocks of a brake together with the piston is displaced in the cylinder
To replace the wheel cylinder assembled
Violation of tightness of the brake system (liquid leak)
To define the place of leak of liquid and to replace the details influencing a leak. At a leak to improve connections in connections of pipelines or to replace sealing laying
The increased gap between a head of an adjusting bolt of the vacuum amplifier and the piston of the main cylinder
See <vacuum amplifier>
The brake pedal slowly moves down at effort, invariable on it, and the tightened parking brake
Damages of a cuff 14 (see fig. 8.3)
To replace the damaged cuff
Brake mechanisms of all wheels or axes rastormazhivatsya not completely (the hung-out wheels rotate hardly)
Lack of a gap between a head of an adjusting bolt of the vacuum amplifier and the piston of the main cylinder
See <vacuum amplifier>
Incomplete return of a pedal of a brake after braking because of the wrong installation of the switch of a signal of braking
To establish a gap (8+1) of mm (see fig. 7.16) between a plastic tip of the switch of a signal of braking and an emphasis on pedals
Contamination of compensation openings of the main brake cylinder or overlapping of compensation openings edges of cuffs 14 (see fig. 8.3)
To remove a tank of the main cylinder and connecting plugs 3 (see fig. 8.3). To clean a soft wire with a diameter of 0,6 mm compensation openings. If at the same time the wire rests against a cuff, then it is necessary to disassemble the main cylinder and to replace the inflated cuffs 14
One brake mechanism does not rastormazhivatsya (the hung-out wheel rotates hardly)
Jamming of the directing fingers in the basis of a forward bracket
To replace or grease the directing fingers. To replace the damaged covers of fingers (see <replacement of the directing fingers>)
Jamming of pistons in the case of a brake bracket
To remove the case of a brake bracket from the basis, to remove dirt and traces of corrosion from the surface of the cylinder of the case and to grease working surfaces with NG-213 liquid or castor oil (see <repair of the brake mechanism of a forward wheel>)
Loss of elasticity of a sealing ring of the case of a brake bracket
To remove the case of a brake bracket from the basis and to replace a sealing ring (see <repair of the brake mechanism of a forward wheel>)
Jamming of blocks because of strong pollution of directing basis groove
To remove blocks and to clear the directing groove and ledges of the basis of corrosion and dirt (see <replacement of blocks of brake mechanisms of forward wheels>)
Easing or breakage of a coupling spring of blocks of the back brake mechanism
To replace a spring
Jamming of pistons of the back brake mechanism because of pollution or corrosion
To disassemble the wheel cylinder, to clear details of dirt and corrosion, to wash out, replace antisplash covers
Swelling of sealing rings of pistons of the back wheel cylinder
To replace sealing rings and brake fluid
Lack of a gap between a brake overlay and a drum of the back brake mechanism because of the wrong installation of a persistent ring of automatic adjustment
To disassemble the wheel cylinder, to eliminate a distortion of a persistent ring
Drift or withdrawal of the car aside when braking
Unequal pressure of air in tires
To bring pressure in tires to norm
Oiling of frictional slips in one of brake mechanisms
To replace blocks or to wash out slips gasoline with the subsequent grinding by a small skin and careful removal of abrasive dust from a slip
Teases or deep risks on a surface of a brake disk or a drum
To repair or replace a disk or the brake drum assembled with a nave
Leak of brake fluid in one of forward brake mechanisms or wheel cylinders
To eliminate a leak
Back wheels are blocked before lobbies because of malfunction of the regulator of pressure or the wrong adjustment of its drive
To adjust or replace pressure regulator (see <adjustment of the regulator of pressure>)
Insufficient efficiency of braking (the increased effort to brake pedals)
Wear or oiling of brake slips
To replace or wash out brake shoes
Incomplete prileganiye of slips to a drum in back brake mechanisms
To smooth out the acting places at slips. If necessary to replace blocks
Thinness in connection of a vacuum hose
To restore tightness of connection
The filter 14 (see fig. 8.2) the vacuum amplifier of brakes is polluted
To wash out the filter or to replace new
The diaphragm 7 or 8 (see fig. 8.2) the vacuum amplifier of brakes is torn
To replace a diaphragm
Sealing cuffs 13 (see fig. 8.2) the vacuum amplifier of brakes do not provide tightness
To replace cuffs and to smooth out the cylindrical working surfaces of the case of valves and a connector
Violation of tightness in connection of a cover 6 (see fig. 8.2) with the case 11 of the vacuum amplifier
To restore tightness
Violation of tightness in connection of the vacuum amplifier with the case of the main cylinder
To replace a sealing ring 12 (see fig. 8.2)
Failure of the vacuum amplifier as a result of hit of brake fluid in a cavity of the vacuum amplifier
To replace sealing cuffs of the main cylinder, to remove liquid from the amplifier and to replace a diaphragm
Jingle in brake mechanisms
Ovality or beating of a working surface of brake drums of back wheels
To chisel brake drums assembled with a nave or to replace with new
Breakage of springs of blocks of a disk brake
To replace brake shoes (see <replacement of blocks of brake mechanisms of forward wheels>)
Wear of the directing fingers of the brake mechanism of a forward wheel
To replace the directing fingers (see <repair of the brake mechanism of a forward wheel>)
Wear of openings under the directing fingers in the basis of a brake bracket
To replace the basis
Deduction of the car requires big effort on the handle of the parking brake
Jamming of cables in the directing covers
To disconnect cables, to clear of dirt, to grease cables and their connections with lubricant <League>
Oiling of overlays of back brake mechanisms
To wash out slips or to replace blocks with slips
The parking brake is incorrectly adjusted
To adjust the drive of the parking brake (see <adjustment of the drive of the parking brake>)
Big course of the handle of the lever of the drive of the parking brake
Big free wheeling of a razzhimny link of the drive of the parking brake in brake mechanisms of back wheels
To adjust the drive of the parking brake (see <adjustment of the drive of the parking brake)
Heating of brake drums at the movement without braking
Wrong adjustment of a razzhimny link of the drive of the parking brake
To adjust the drive of the parking brake
The lowered level of brake fluid in a tank of the main brake cylinder in the absence of an external leak in a hydraulic actuator
Wear or swelling of an external cuff 8 (see fig. 8.3) the main brake cylinder
To remove the main brake cylinder and to replace a cuff. To merge from a cover 6 (see fig. 8.2) the vacuum amplifier brake fluid