9.14. Possible malfunctions of brake management

REASON

ELIMINATION METHOD

Leak of brake fluid from a hydraulic actuator of the brake system

To establish the reason of a leak and to eliminate with replacement of the damaged details or tightening carving соединений*. To pump over a hydraulic actuator and brakes

Penetration of air due to the lack of liquid in a tank of the main cylinder of a brake

To fill in brake fluid in a tank of the main cylinder of a brake to normal level and to pump over a hydraulic actuator

Unsatisfactory work of cuffs of the main cylinder of brakes

To disassemble the main cylinder of brakes and to replace defective parts

Increase in a gap between blocks and a drum in a back brake because of violation of operability of the automatic device

To weaken action of a coupling spring of blocks shift of one of its ends in nearby the opening located on a block edge to dia. 5 mm. If at the same time operability of the automatic device is not restored, through a big opening in the brake drum at the removed wheel to define a block at which "sock" (the end of a block leaning on the piston of the wheel cylinder) moves during the pressing and an otpuskaniye of a pedal more than to 2 mm (1,4–1,7 mm at the serviceable mechanism). To remove a drum and to be convinced by measurement of diameter on blocks in their middle part of correctness of establishment of defect – diameter less than 229 mm indicates violation of operability of the automatic device. To replace a persistent ring in the wheel cylinder of a brake

Wrong adjustment of the vacuum amplifier

To replace the amplifier or to adjust him at service station

Opening contamination in a cover of a tank of the main cylinder of a brake

To clean an opening

Incomplete return of a pedal of a brake back after an ottormazhivaniye

To remove a pedal of a brake and to clear its axis of dirt, rusts, to smooth out agnails at the plastic plugs inserted into a pedal opening. To replace an ottyazhny spring of a pedal

Swelling of cuffs of the main thing and wheel cylinders

To merge brake fluid and to wash out a hydraulic actuator fresh brake fluid, to replace the damaged rubber details. To fill in the recommended brake fluid in system

Contamination of compensation openings of the main cylinder of a brake

To remove a tank of the main cylinder of a brake and connecting plugs. To clean a soft wire to dia. 0,6 mm compensation openings

Overlapping of compensation openings a cuff edge because of incomplete withdrawal of the piston back at completely released pedal or because of swelling of a cuff

To disassemble the main cylinder of a brake, to wash out details fresh brake fluid. To assemble the main cylinder of a brake and to be convinced that pistons vigorously depart back, releasing compensation openings. When swelling cuffs to wash out details of the main cylinder of a brake alcohol or fresh brake fluid and to replace cuffs

Easing or breakage of a coupling spring of blocks

To replace a spring

Not return of blocks in from a tormozhenny state because of swelling of cuffs wheel the cylinder

To remove the brake drum, blocks, to take out pistons from the wheel cylinder. To carefully wash out details of the wheel cylinder fresh brake fluid and to replace the damaged cuffs

Distortion of blocks because of violation of provision of basic racks owing to deformation of boards

To remove the brake drum and blocks and to correct boards with basic racks to the parallel provision of blocks concerning a drum

Cables of the drive of the parking brake system are excessively tense

To adjust a tension of cables

Wrong adjustment of length of an expansion level

To adjust length of an expansion level in the corresponding back brake

Jamming of blocks because of excessive pollution of basic surfaces of a support

To remove blocks. To clear basic surfaces of blocks of a support, use of white spirit with the subsequent washing with soap water and drying with a stream of compressed air is allowed for removal of pollution

Jamming of pistons because of pollution in bracket cylinders

To remove a bracket, to remove pollution, to replace antisplash covers

Pollution or oiling of overlays of brake shoes

To clear a brake of dirt and oil. To replace blocks with greasy slips, or to carefully clear surfaces of slips and to wash out hot water with soap a hair brush. To establish and remove the cause of oiling of blocks (to check a condition of cuffs of pistons of wheel cylinders)

Contamination of the pipelines or hoses bringing liquid to wheel cylinders of brakes on one of the parties of the car

To sort and wash out pipelines, hoses and connecting couplings alcohol or fresh brake fluid, to blow dry compressed air, if necessary to replace the mentioned details

Teases on the working surface of the reel of a back brake

To remove a drum and to smooth out the damaged places. If necessary to chisel, proshlifovat or replace a drum

Back wheels are blocked before lobbies because of malfunctions of the regulator of pressure:

  – pressure regulator is incorrectly adjusted

To adjust pressure regulator

  – a leaky prileganiye of a ball in pressure regulator sleeve nest

To disassemble the regulator of pressure, to condense with easy blows of the hammer through a mandrel a ball in a valve nest

  – the cuff of a big step of the piston of the regulator of pressure collapsed

The regulator of pressure to sort, replace the damaged cuff

  – lack of tightness between regulator cavities because of destruction of consolidation between cavities

The regulator of pressure to sort, wash out all details, to replace the damaged consolidations

Pollution or oiling of overlays of brake shoes

To clear a brake of dirt and oil, to replace blocks with greasy slips, or to carefully clear surfaces of slips and to wash out hot water with soap a hair brush. To establish and remove the cause of oiling of blocks (to check a condition of cuffs of pistons of wheel cylinders)

Bad prileganiye of brake slips to the working surface of brake drums

To saw round the acting places of slips a file. Not to saw round new slips as after the car run about 500 km they are earned extra

The diaphragm of the amplifier is damaged

To replace a diaphragm

Damage of an external cuff of the main cylinder of a brake

To replace a cuff

The cuff of the case of the piston of the amplifier is damaged or polluted

To replace a cuff, to clear the case of the piston of the amplifier of dirt and to grease

The surface of the case of the piston of the amplifier is damaged

To replace the amplifier

The sealing ring of a cover of the amplifier is damaged

To remove the main cylinder of a brake, to replace a sealing ring of a cover of the amplifier

Tightness of consolidation of the backpressure valve of the amplifier is broken

To replace rubber consolidation

Difficult movement of pistons in cylinders of brackets of a forward brake at excessive pollution of "mirror" of cylinders or swelling of cuffs because of hit of mineral oils

To sort brackets and to replace the damaged details, to smooth out the surfaces of cylinders

Pulling and weakening of cables of the drive

To adjust a tension of cables

Jamming of a back cable in the directing tubes of boards of back brakes

To disconnect a cable, to clean the directing tubes and to grease cable branches. After installation of a cable to be convinced of its free movement in tubes