TM 10-4610-241-24
TO 40W4-13-42
Table 2-2. Unit Troubleshooting-continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
4.
AIRBRAKE SYSTEM (Models WPES-10 and H-9518-1) - continued.
BRAKES DRAG OR REMAIN LOCKED.
Step 1.
Check if brakes are manually disabled. Refer to Paragraph 2-89.
If disabled, enable them. Refer to Paragraph 2-89.
Step 2.
Check all compressed air system tubes, fittings, and components for leaking air, using soap solution.
a.
If compressed air system is not losing pressure, replace relay valve. Refer to Paragraph 2-85.
b.
If air tubing or fitting, is leaking air, replace defective tubing. Refer to Paragraph 2-83.
c.
If coupling half is leaking, repair airbrake hose assembly. Refer to Paragraph 2-83.
d.
If air cleaner assembly is leaking air, replace air cleaner assembly. Refer to Paragraph 2-84.
e.
If reservoir is leaking air, replace reservoir, Refer to Paragraph 2-83.
f.
If reservoir drain cock is leaking air, replace reservoir drain cock. Refer to Paragraph 2-83.
g.
If air chamber assembly is leaking air, replace air chamber assembly. Refer to Paragraph 2-89.
h.
If airbrake relay valve is leaking air, replace relay valve. Refer to Paragraph 2-85.
TRAILER ROLLS WHEN DISCONNECTED FROM TOWING VEHICLE.
Step 1. Check if brakes are manually disabled. Refer to Paragraph 2-89.
If brakes are disabled, enable them (Paragraph 2-89).
2-62 Change 1
