TM 5-3805-248-23-1
BRAKE SYSTEM TROUBLESHOOTING PROCEDURES - CONTINUED
0014 00
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
Service Brakes Do Not
e. Apply and hold brakes. Make sure
1. If no air is released, there is a restriction.
air is rushing out from loose fitting.
Apply - Continued.
Unblock or replace brake signal line(s)
2. If both front brakes or both rear brakes
still won't engage, replace air brake
relay valve (WP 0159 00 and WP 0160
3. If both front brakes or both rear brakes
still won't engage, replace brake control
valve (WP 0155 00).
7.
Make sure park and emergency brakes
1. If park and emergency brakes release,
release at normal operating pressure
replace brake control valve (WP 0155
(TM 5-3805-248-10).
2. If park and emergency brakes do not
release, go to Malfunction 4.
2.
Service Brakes Do Not
Release.
WARNING
Eye protection must be worn when performing maintenance where components
or particles could fly out during procedure. Failure to take precautions may
cause injury.
Make sure wheels are chocked and bowl is lowered to ground for all tests. Fail-
ure to do so may cause injury or death.
1.
Verify
park/emergency
brakes
disengage.
If air pressure does not build, go to
a. Run engine and allow air pressure to
reach normal operating range (TM
Malfunction 7.
5-3805-248-10).
b. Shut down engine (TM 5-3805-248-
10).
If any of four actuators do not move, go to
c. While watching for actuator
movement, release park and
Malfunction 4. If all actuators move, go to
emergency brakes (TM 5-3805-248-
Test 2.
10).
2.
Verify which brakes do not release.
