Brake Lining - Komatsu 830E Shop Manual

Oil used in the hydraulic source must be of the
same type as used in the Brake Circuit on the
Komatsu truck.
4. Attach hydraulic source to inlet port of caliper
assembly.
5. Bleed air from caliper assembly.
During testing or bleeding procedure, DO NOT
allow oil to come into contact with brake linings.
6. Gradually increase hydraulic pressure to 1200 psi
(8.4 MPa), observing piston assembly for leak-
age.
7. Reduce pressure to 0 psi (0 MPa) and repeat
Step 6 three times.
8. If no leakage has been observed, reduce pres-
sure to 0 psi (0 MPa) and disconnect hydraulic
source.
9. After caliper has been installed on wheel assem-
bly prior to lining installation, pry each piston until
fully retracted into caliper housing.
NOTE: Use adequate force to pry each piston into
caliper fully into housing.
10. Install brake calipers according to "Installation"
instructions this Section.
J06020

BRAKE LINING

Replacement
Inspect brakes periodically for wear. Linings must be
replaced when lining material has been worn to a mini-
mum of 0.31 in. (7.8 mm). Use of linings beyond this
wear limit will result in a decrease of braking action,
and possible damage to disc.
When replacing linings, never mix new and used
linings in an assembly.
NOTE: Considerable force will be required to retract
piston. If a piston should move too easily, brake should
be removed for complete disassembly for inspection of
grip and return pin assembly. In returning pistons to a
retracted position, care must be taken not to damage
dust shields with retraction tool.
Rockwell Armature Speed Rear Disc Brakes
FIGURE 6-16. REAR BRAKE CALIPER LINING
REPLACEMENT
1. Capscrew
1. To change linings, remove retaining plates (2,
Figure 6-16) on the end of caliper and slip out
worn linings.
2. Before installing new linings, pistons must be
forced back into brake assemblies until fully
retracted, using a piston retraction tool (Figure 6-
17) or similar tool, between face of piston and
disc.
2. Retaining Plates
J6-13