Table 2-2. Unit Troubleshooting-continued
TEST OR INSPECTION
AIRBRAKE SYSTEM (Models WPES-10 and H-9518-1)
Ensure that towing vehicle brakes are operating properly.
Connect trailer coupling halves to towing vehicle.
Refer to illustrations in text to assist in troubleshooting.
POOR OR NO BRAKING ACTION.
Step 1. Check all compressed air system tubes, fittings, and components for leaking air using soap solution.
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. Refer to
If coupling half is leaking air, repair or replace airbrake hose assembly. Refer to Paragraph 2-83.
If air cleaner assembly is leaking air, tighten loose connections and/or repair air cleaner assembly.
Refer to Paragraph 2-84.
If reservoir drain cock is leaking air, replace reservoir dram cock. Refer to Paragraph 2-83.
If reservoir is leaking air, replace reservoir. Refer to Paragraph 2-83.
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