Table 2-2. Unit Troubleshooting -continued
TEST OR INSPECTION
AIRBRAKE SYSTEM (Model WPES-1)
Ensure that towing vehicle brakes are operating properly.
Connect trailer coupling halves to towing vehicle.
Refer to illustrations in text to assist in troubleshooting.
1. POOR OR NO BRAKING ACTION.
Step 1. Check all compressed air system tubes, fittings, and components for leaking air.
a. If compressed air system is not losing air pressure, go to step 2.
If compressed air tube or fitting is leaking air, repair or replace airbrake system tubing.
c. If coupling half is leaking air, repair or replace airbrake hose assembly Refer to paragraph 2-96.
d. If brake line air cleaner is leaking air, tighten loose connections and/or repair brake line air cleaner. Refer
e. If reservoir is leaking air, replace reservoir. Refer to paragraph 2-96.
f. If reservoir drain cock is leaking air, replace reservoir drain cock. Refer to paragraph 2-96.