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6.1.9. Dismantling, check and assembly of a brake support

Remove a forward wheel.
Turn off a bolt of fastening of a brake hose to a support.
Turn off bolts of fastening of the cylinder of a support.
Remove the cylinder and brake shoes.

Fig. 6.25. Bolts of fastening of a support to a rotary fist


Turn off bolts of fastening of a support to a rotary fist (fig. 6.25).
Remove a support.

Dismantling
Remove a piston boot.

Fig. 6.26. Extraction of the piston from a support


By means of compressed air squeeze out the piston from a support (fig. 6.26).

Fig. 6.27. Removal of consolidation of the piston


By means of the screw-driver remove consolidation of the piston (fig. 6.27) from a support.

NOTE
Do not place fingers between the piston and a support.
Be careful, do not spray brake fluid.

Check
Check a support for lack of wear, cracks, rusts in openings under pistons.
Estimate a condition of pistons. At wear or teases replace the piston.
Check a condition of the plug and a finger.
Be convinced of absence of damage of springs of blocks and boots of pistons.

Fig. 6.28. Measurement of thickness and beating of a brake disk


Measure thickness and a beating of a brake disk (fig. 6.28).

ATTENTION
Do not restore the surface of the piston an emery paper.
All rubber details cannot be established repeatedly.

Thickness of a brake disk
Nominal: 24 mm.
Limit: 22,4 mm.
Disk beating: 0,08 mm, no more.
Difference of thickness of a brake disk: 0,01 mm.

NOTE
The difference of thickness of a brake disk is defined by a difference of the minimum and maximum thickness measured in eight points on a circle approximately in 10 mm from edge of a disk.

The beating of a disk is determined by a circle in 5 mm from edge of a disk.
At impossibility of carrying out repair replace a brake disk.

Assembly
Wash out all details (except blocks and laying of blocks) isopropyl alcohol.
Grease consolidation of the piston with special lubricant and establish consolidation in a support opening flute.

Fig. 6.29. Piston and boot


Install the piston and its boot (fig. 6.29).
Grease with special lubricant a support opening under the piston, the external surface of the piston and a boot.

Fig. 6.30. Scheme of installation of the piston and boot


Install a boot on the piston, as shown in the figure 6.30.
Insert a boot into a support opening flute, push the piston in a support.

Fig. 6.31. The scheme of assembly of the sliding parts of a support


Collect the sliding parts of a support (fig. 6.31).
Grease with special lubricant the plug, a finger and an opening of a support under the plug. Grease also boots of the plug and a finger.
Establish a boot in a support opening flute.
Establish brake shoes.

NOTE
Do not allow hit of lubricant on blocks and a brake disk.
Before an inhaling of bolts be convinced that the surfaces of the sliding finger and the directing bolt are not damaged.
Pump over the brake system. Be convinced of lack of leak of brake fluid.