TM 9-2330-386-14&P
ORGANIZATIONAL TROUBLESHOOTING TABLE - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
BRAKES - continued
4. NO BRAKES OR WEAK BRAKES - continued.
S t e p 4.
Check air pressure gage on towing vehicle for a minimum of 90 psi.
a. If air pressure is low, build up pressure to normal level.
b. If air pressure is low and will not build up, troubleshoot
t o w i n g vehicle air system. (See maintenance manual for towing
vehicle.)
c. If air pressure gage indicates normal, go to step 5.
S t e p 5.
Check air lines and connectors for restrictions and leaks.
a. Remove any restrictions from hoses and tighten connections.
Repair or replace as necessary (para. 4-27).
b. If air lines and connections are not restricted or leaking, go
to step 6.
Step 6.
Test operation of emergency relay valves (para. 4-29).
a. If emergency relay valve is defective, replace (para. 4-29).
b. If emergency relay valves are operating, go to step 7.
WARNING
T o prevent injury, keep hands away from brake chamber
push rods and slack adjusters. They will move as service
brakes are operated, and will automatically apply if
system pressure drops.
S t e p 7.
Have a helper apply and hold the towing vehicle service brakes.
Using soapy water, check spring brake chambers for leaks at clamp
bands and hose fittings.
a . If leaks are seen at brake chamber clamp band, replace spring
brake chamber (para. 4-32).
b. If leaks are seen at hose fitting, tighten hose fitting or
replace hose (para. 4-27).
c. If brake chambers are not leaking, go to step 8.
S t e p 8.
Check brake adjustment.
a. If brakes are out of adjustment, check operation of automatic
slack adjusters (para. 4-36). Replace all defective slack
adjusters.
b. If brakes are not out of adjustment, go to step 9.
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