Table 2-2. Unit Troubleshooting -continued
TEST OR INSPECTION
AIRBRAKE SYSTEM (Model WPES-l) - continued
g. If air chamber assembly is leaking air, replace air chamber assembly. Refer to paragraph 2-102.
h. If airbrake relay valve is leaking air, notify Direct Support Maintenance.
Step 2. Loosen service brake line air filter tube fitting on tube leading to airbrake relay valve. Check for high-
pressure air leaking.
a. If high-pressure air is leaking, tighten fitting and go to step 3.
b. If air leaks slowly or not at all, repair or service brake line air cleaner. Refer to paragraph 2-97.
Step 3. Tell assistant to pump towing vehicle brake pedal several times while you are watching air chamber action
on all four brakes.
a. If all air chambers assemblies operate, go to step 4.
b. If one or more air chamber assemblies pushrods fail to operate, replace defective air chamber. Refer to
c. If all air chamber assembly pushrods do not operate or operate slowly, replace airbrake relay valve.