BRAKE SYSTEM TROUBLESHOOTING PROCEDURES - CONTINUED
TEST OR INSPECTION
Listen for a quick blast of air escaping
1. If air escapes slowly out or does not
from quick release and holding
Brakes Do Not Engage -
exhaust from quick release and holding
valve(s) while applying park and
valve(s) at all, replace quick release and
2. If air escapes normally, go to Test 4.
Inspect brakes for broken,
1. Replace or repair brakes as necessary
disconnected or damaged parts.
2. Adjust actuators travel to 2.5 in. (63.5
3. If problem still exists, replace
actuator(s) for brake(s) in question (WP
Check for stuck park and emergency
If park and emergency brakes engage,
valve by disconnecting park and
replace park and emergency valve (WP
emergency brake delivery line from
Do Not Release.
Eye protection must be worn when performing maintenance where components
or particles could fly out during procedure. Failure to take precautions may
Make sure wheels are chocked and bowl is lowered to ground for all tests. Fail-
ure to do so may cause injury or death.
Run engine to allow air pressure to
If air pressure does not build, go to
reach a minimum of 60 psi (414 kPa).
Verify park and emergency brake
a. Run engine and allow air pressure to
reach normal operating range (TM
b. Shut down engine (TM 5-3805-248-
1. If one or more (not all) actuators do not
c. While watching for actuator
movement, apply and release park
move, go to Step 3.
and emergency brakes (TM 5-3805-
2. If all four actuators do not move, go to