TM 9-2330-383-14&P
4-9. UNIT TROUBLESHOOTING TABLE (CONT)
Table 4-2. Unit Troubleshooting Table - CONT
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
BRAKES - CONT
Step 2.
Check operation of brake control valve (table 2-1).
a.
If brake control valve does not operate properly, replace valve
b.
If brake control valve operates properly, proceed to step 3.
Step 3.
Check operation of brake chambers (table 2-1).
Replace any chamber not functioning properly (para. 4-20).
2. NO BRAKES OR WEAK BRAKES.
Step 1.
Check for low air pressure (leakage at connection, air lines, or
valves) (table 2-1).
a.
If air lines/connections are leaking, repair or replace as
needed (para. 4-21).
b.
If brake control valve, relay valve, or multifunction valve is
leaking, replace defective valve (para. 4-23, 4-24, or 4-25).
c.
If air lines/connections or valves are not leaking, proceed to
step 2.
Step 2.
Check for relay valve operation by observing action of brake air
chambers.
a.
If brake air chambers do not operate, replace relay valve
b.
If action of brake air chambers is not positive, replace relay
valve (para. 4-23).
c.
If a single brake air chamber does not operate properly,
replace brake chamber (para. 4-20).
Step 3.
Inspect for grease on brake lining.
a.
If grease is present on brake lining, replace defective seals
and brake shoes (para. 4-16).
b.
If grease is not present on brake lining, proceed to step 4.
