14.6. Brake system
On all models since the end of 1984 the ventilated forward brake disks and new supports because of increase in thickness of disks are established.
Replacement of brake shoes on back disk brakes
Block forward wheels, then lift a back part of the car and fix on support. Remove back wheels and you rastormozit the car the parking brake.
Weaken a lock-nut and disconnect a cover of a cable of the parking brake from a support arm.
Fig. 14.34. Elements of the back disk brake mechanism: 1 – cable of the parking brake;
2 – brake hose; 3 – brake shoes and support; 4 – the directing fingers; 5 – bearing; 6 – nut; 7 – nave cap; 8 – brake disk; 9 – support arm; 10 – protection cover of a back brake
Disconnect a cable of the parking brake from the support lever (fig. 14.34).
Turn out and remove the top and lower directing support fingers. Disconnect a support from an arm and put it on the protection cover of a back brake not to stretch a brake hose.
The screw-driver wring out brake shoes from a support. Mark the provision of a protivoskripny spring.
Brush clear an internal cavity of a support and check a piston epiploon for tightness. If it passes brake fluid, remove a support for repair or replace it. Remove all remains of an external brake shoe which remained after it on a support.
The flat-nose pliers inserted into special openings turn the piston against the stop clockwise and at the same time press it into a support that will allow to install the self-regulation mechanism in initial situation and will increase additional space for installation of new brake shoes. The final provision of cuts has to be such that the adjusting pin of an internal block entered an internal cut.
The tube with soil is delivered together with new brake shoes. Apply a layer of earth on the back party of an external block just before its installation.
Establish a protivoskripny spring in openings in brake shoes. Having squeezed two blocks together, establish them in a support, having checked that the adjusting pin on an external block entered an opening in the piston, and springs on an external block were recorded on the branched ends of a support.
Establish a support on an arm. Apply a little high-temperature lubricant on the sliding surfaces of the directing fingers and the plug, then screw the directing fingers and tighten them the required inhaling moment. Cones of fingers have to be pure densely to sit.
Establish a cover of a cable of the parking brake on an arm and tighten a nut.
Connect a cable of the parking brake to the support lever.
Establish back wheels and lower the car on the earth.
Press a brake pedal several times to establish brake shoes into position.
Removal and installation of a support of back disk brakes
Block forward wheels, lift a back part of the car and fix on support.
Remove back wheels and you rastormozit the car the parking brake.
Weaken a lock-nut and disconnect a cover of a cable of the parking brake from a support arm. Disconnect a cable of the parking brake from the support lever (see fig. 14.34).
Establish a hose clip on the brake hose going to a support.
Turn out a hollow bolt and remove a brake hose from a support. Remove washers.
Twist the top and lower directing fingers and remove a support from an arm. Wring out brake shoes.
Check the directing fingers and plugs for existence of wear and damages; if it is necessary, replace them.
Installation is carried out to the sequences, the return to removal. Tighten all bolts and nuts the required moment, remove air from the hydraulic drive of the brake system. Press a brake pedal several times to establish brake shoes into position.
Repair of a support of back disk brakes
Remove a support and carefully clear its external surface.
Take the piston from a support for what give air under low pressure to the brake cylinder through an opening for connection of a brake hose, having established wooden whetstone instead of brake shoes. Pressure of air has to be sufficient only for pushing out of the piston of an opening. The piston which is taking off under the influence of big effort even if wooden whetstone remains on the place, can be damaged.
Fig. 14.35. Elements of a support of a back disk brake: 1 – union of removal of air;
2 – rubber cap; 3 – top dustproof consolidation; 4 – finger; 5 – clip; 6, 16 – dustproof consolidations; 7 – piston; 8 – piston epiploon; 9 – lock ring; 10 – emphasis; 11 – sealing ring; 12 – self-regulating spindle of the parking brake; 13 – lower dustproof consolidation; 14 – spindle lever;
15 – returnable spring; 17 – cap; 18 – fixing arm of a cable of the parking brake
Remove a clip and dustproof consolidation from the piston (fig. 14.35).
Take a piston epiploon from the support cylinder.
Flat-nose pliers with thin sponges take out a lock ring from below of the support cylinder.
Remove a self-regulating spindle of the parking brake, a sealing ring, an emphasis and a finger.
Remove dustproof consolidations and covers of the directing fingers.
Turn out bolts of fastening of an arm of a cover of a cable of the parking brake.
Disconnect a returnable spring, remove the lever of a spindle and an epiploon.
If it is necessary, turn out the screw of removal of air.
Clear all elements and check them for existence of wear and damages. In particular, check the surfaces of the piston and the cylinder of a support, and also the needle bearing of an adjusting spindle.
Acquire a repair set of consolidations, other necessary spare parts. Repair will require lubricants of red, white and orange color: lubricant of red color – for an epiploon of the piston, white color – for a sealing ring of an adjusting spindle and orange color – for dustproof consolidations, the needle bearing, a spindle and guides of fingers.
Assembly is carried out to the sequences, the return dismantling; at the same time check that lock pins entered support case openings.