6. While fully applying the service brake pedal, check
brake wear as follows:
a. Remove wear indicator cover (1, Figure 5-2).
b. Push pin (8) in until it stops against brake
piston.
c. Measure the distance from indicator pin end
face (2) to housing face (3).
If pin end face (2) is even with the housing
face (3) or below, disc pack is worn to maxi-
mum safe wear limits. Brakes should be
scheduled for rebuild.
If pin end face (2) extends out beyond hous-
ing face (3), brake disc wear is still within al-
lowable limits.
7. Pull pin (8) out until it stops against tool housing
(6) and install protective cover (1).
9. Release brakes. Shut down engine, allow steering
accumulators to bleed down. Open brake accu-
mulator bleeddown valves to remove all pressure
from the brake sytem. Close valves after all pres-
sure is released.
10. Remove the brake disc wear indicator tool and
reinstall O-ring plug in port.
11. To check the remaining brake assemblies, repeat
steps 4. through 10.
NOTE: Checking disc wear in all brake assemblies is
recommended. Disc wear in one brake assembly may
be different from the other due to dissimilar operation
of parts and/or haul profiles which require repeated
braking while steering in one direction only.
12. Refill hydraulic tank as required.
13. If brake repairs are necessary, refer to “Brake
Rebuild”, this section.
NOTE: If any leakage is observed around the brake
disc wear indicator tool, replace O-rings (4, 5 and 7
Figure 5-2).
FIGURE 5-3. BRAKE WEAR INDICATOR
INSTALLATION
(Left Front Brake Shown)
1. Brake Assembly
2. Brake Apply Line
3. Brake Cooling Line
4. Diagnostic Coupler
5. Wear Indicator
Installation Port
J05018 03/01 Disc Brake Assembly J5-3
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