7.2. Possible malfunctions of brakes, their reasons and methods of elimination


Cause of defect
Elimination method
Insufficient efficiency of braking
1. Leak of brake fluid from wheel cylinders of forward or back brakes
1. Replace unusable details of wheel cylinders, wash out and dry blocks and drums, pump over
system of a hydraulic actuator
2. Air in the brake system
2. Remove air from system
3. Are damaged rubber a sealant in the main brake cylinder
3. Replace a sealant and pump over system
4. Rubber hoses of system of a hydraulic actuator are damaged
4. Replace hoses
Spontaneous braking at the working engine
1. An air suction in the vacuum amplifier between the case of the valve and protective
cap:
a) destruction, sealant distortion
covers or its bad fixing owing to damage of the stopping details,
wear of a sealant
b) insufficient lubricant of a sealant
covers
1. Do the following:



a) replace the vacuum amplifier
b) remove a protective cap and put lubricant in a sealant
Incomplete disinhibition of all wheels
1. There is no free wheeling of a pedal
brakes because of the wrong situation
stoplight switch
1. Adjust position of the switch
2. The vystupaniye of an adjusting bolt of the vacuum amplifier concerning the plane of fastening of the main thing is broken
cylinder
2. Adjust a vystupaniye
(1,25-0,2 mm) adjusting bolt
3. Jamming of the case of the valve vacuum
the amplifier owing to swelling of a diaphragm or jamming of a sealant
covers of the amplifier or protective cap
3. Replace the vacuum amplifier
4. A contamination of a compensation opening in the main cylinder
4. Clean an opening and pump over
system of a hydraulic actuator
5. Swelling of rubber sealants
the main cylinder owing to hit in liquid of gasoline, mineral
oils, etc.
5. Carefully wash out all system
brake fluid, replace the damaged rubber details, pump over system of a hydraulic actuator
6. Jamming of the piston of the main cylinder
brakes
6. Check and if necessary replace the main cylinder, pump over
system
Snubbing of one of wheels at the released brake pedal
1. The coupling spring of blocks of a back brake weakened or broke
1. Replace a spring
2. Jamming of the piston in the wheel cylinder owing to corrosion
2. Disassemble the cylinder, clear and
wash out the details damaged replace
3. Swelling of sealing rings
the wheel cylinder because of hit in
liquid of fuels and lubricants
3. Replace rings, wash out brake fluid system of a hydraulic actuator
4. Lack of a gap between blocks and a drum
4. Adjust the parking brake
5. Violation of provision of a support of rather brake disk when weakening bolts of fastening to an arm
5. Tighten fastening bolts, if necessary replace povrezhenny
details
6. The raised beating of a brake disk (more than 0,15 mm)
6. Proshlifuyte disk, if thickness
not less than 9 mm, replace a disk
Drift or withdrawal of the car aside when braking
1. Leak of brake fluid in one
from wheel cylinders
1. Replace a sealant and pump over system
2. Jamming of the piston of the wheel cylinder
brakes
2. Check and eliminate jamming
the piston in the cylinder, if necessary replace the damaged details
3. Blockage any steel
tubes owing to a dent
3. Replace a tube or clean it
also pump over system
4. Different pressure in tires
4. Adjust pressure
5. Wrong angles of installation of wheels
5. Adjust corners
6. Pollution or oiling of disks, drums and slips
6. Clear details of brake mechanisms
7. Wrong installation of the regulator
pressure
7. Adjust position of the regulator of pressure
8. Pressure regulator is faulty
8. Repair or replace pressure regulator
The increased effort of pressing a brake pedal
1. The air filter of the vacuum amplifier is littered
1. Replace the air filter
2. Jamming of the case of the valve of the vacuum amplifier owing to swelling of a diaphragm or jamming of a sealant of a cover of the amplifier or a protective cap
2. Replace the vacuum amplifier
3. The hose is damaged, the connecting vacuum amplifier and an inlet pipe of the engine or its fastening on unions weakened
3. Replace a hose or tighten collars of its fastening
4. Swelling of sealants of cylinders because of hit in liquid of gasoline, mineral oils etc.
4. Carefully wash out all system,
replace the damaged rubber
details; pump over system
Scratch or squeal of a brake
1. Weakening of a coupling spring of brake shoes of a back brake
1. Check a coupling spring and at
replace need new
2. Ovality of brake drums of back brakes
2. Chisel drums
3. Oiling of frictional slips
3. Smooth out slips metal
brush, applying warm water with detergents. Remove the cause
hits of liquid or lubricant on
brake shoes
4. Wear of slips or inclusion in them of foreign matters
4. Replace blocks
5. Excessive beating of a brake disk or uneven wear
5. Proshlifuyte a disk, at a thickness
less than 9 mm - replace a disk