12.14. Support of a forward brake

2. Turn out a hollow bolt and disconnect from a support a brake hose. For an exception of an effluence of brake liquid close an opening in a brake hose a suitable stopper.

3. Turn out two bolts and remove a support with the brake cylinder.

1. Twist directing fingers and remove a support from the holder.

3. Remove a piston cover.

4. The compressed air squeeze out the piston from the support cylinder.

At piston expression by the compressed air have no fingers in front of the piston.

5. An edge of a screw-driver remove a sealing ring from the piston, thus do not damage a cylinder surface.

6. Measure thickness of a brake disk. By the indicator of hour type measure palpation of a brake disk at small distance from external edge.

Thickness of a brake disk:

• The nominal: 24 mm
• The minimum admissible: 22,4 mm
• Maximum permissible palpation: 0,08 mm.
• Maximum permissible difference of thickness of a brake disk: 0,01 mm

1. Turn out bolts of fastening of a support, lift a support up and fix it a wire.

3. The indicator of hour type check palpation of a brake disk. The indicator of hour type fix in any convenient place and, turning a brake disk, define its palpation at distance of 5 mm from external edge.

Maximum permissible palpation: 0,05 mm.

1. If palpation of a brake disk exceeds maximum permissible value, change the provision of a disk in relation to a nave and repeatedly measure palpation of a brake disk.

1. Before shift of a brake disk, note the party of a nave of a wheel in which the maximum palpation is observed.
2. Remove a brake disk, then establish the indicator of hour type as is shown in drawing, move a nave to the axial direction and will measure люфт.
   Maximum permissible люфт: 0,05 mm
   If люфт exceeds maximum permissible, check each element of a suspension bracket.
3. If люфт does not exceed maximum permissible value, establish a brake disk in the situation turned on 180 ° from a label and repeatedly measure palpation of a brake disk.

2. If palpation cannot be eliminated with shift of a brake disk, replace a brake disk or process it on the special machine (" MAD, DL–8700 PF" or equivalent). The processed brake disks a part have smaller palpation, than new brake disks.

1. By a micrometer measure thickness of a disk in eight places, approximately through everyone 45 ° at distance of 10 mm from external edge of a disk.

Thickness of a brake disk:

• The nominal: 24 mm
• The minimum admissible: 22,4 mm
• Maximum permissible difference of thickness of a brake disk (in 8 places): 0,015 mm

2. Put special greasing on a sealing ring of the piston and establish it in a piston flute.

4. Establish a cover of the piston and a ring of fastening of a cover.

5. Establish covers of directing fingers and directing fingers.

2. Screw and tighten the demanded moment of an inhaling a hollow bolt of fastening of a brake hose.

Moments of an inhaling of the union of pumping: 7–13 N • m