Park Brake Lining; Park Brake Burnish Procedure; Brake Bleeding Procedure - Komatsu 830E Shop Manual

PARK BRAKE LINING REPLACEMENT
Inspect park brake linings periodically for wear. Lin-
ings must be replaced before lining material has
been worn to the top of the retaining screws. Use of
linings beyond this wear limit will result in decrease
of braking action, and possible damage to disc.
1. Change linings. Refer to "Park Brake Caliper
Removal" and "Disassembly" procedure.
2. Remove screws (14, Figure 7-2) releasing the
lining (5) from the piston (10).
3. Install new lining and secure lining to piston with
screws (14).
NOTE: If lining mounts screws are reused, use
®
Loctite No. 242 (or equivalent) on threads.
4. After lining replacement, refer to "Park Brake
Caliper Installation, Bleeding, Adjustment and
Conditioning".

PARK BRAKE BURNISH PROCEDURE

Lining Conditioning
1. Preheat brake disc with service brakes to clean
and heat rear discs to between 350° F - 500° F
(177°C - 260° C).
2. Park on hot disc (3 to 5 minutes) to clean and
heat parking brake linings.
NOTE: Parking capabilities can be tested by parking
loaded truck (Do NOT exceed rated GVW shown
on Grade/Speed decal in cab) on steepest hauling
grade in mine (not to exceed 15% grade).
If parking brake does not hold on grade, allow vehicle
to start to roll down grade for approximately 15 ft.
(4.6 m), then stop truck with service brakes. While
holding truck with service brakes, release park brake.
Reapply park brake and release service brakes.
If park brake still does not hold truck, refer to "Park-
ing Brake Adjustment" and repeat procedure.
J7-6

BRAKE BLEEDING PROCEDURE

1. Bleed parking brake after starting engine.
2. Move parking brake switch on instrument panel
to "Off" position. Connect bleeder hose to
bleeder valve, open bleeder valve until clear air-
free oil (no bubbles) runs from hose. Close
bleeder valve.
3. Repeat for each bleeder.
Rockwell Parking Brake J07013