TM9-2330-368-14 & P
Table 4-2. Troubleshooting Table (cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
BRAKES
2. NO BRAKES OR WEAK BRAKES (cont).
Step 5.
Check for relay valve operation by observing action of air brake chambers.
a. If air brake chambers do not operate, replace relay valve (para. 4-18a).
b. If action of air brake chambers is not positive, replace relay valve.
If a single air brake chamber does not operate properly, replace brake chamber
c.
3. SLOW BRAKE APPLICATION OR SLOW RELEASE.
Step 1.
Check for low air pressure (leakage at connections, air lines or valves) (Table 2-1).
a. If air lines/connections are leaking, repair or replace as needed.
b. If valve is leaking, replace defective valve.
c. If air lines/connections and valves are not leaking, proceed to step 2.
Remove and check for restrictions in air lines and hoses (para. 4-17).
Step 2.
a. If air lines or hoses are restricted, replace as required.
b. If air lines or hoses are not restricted, proceed to step 3.
Step 3.
a. If a spring is defective, replace spring.
b. If any spring is not defective, proceed to step 4.
Step 4.
a. If one air brake chamber operates slowly, replace defective brake chamber.
b. If all air brake chambers operate slowly, replace relay valve.
C.
If all air brake chambers still operate slowly, replace trailer valve.
4-12