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Page Title:
PARKING (SPRING) BRAKES WON'T RELEASE (Cont) |
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 TM 9-2320-285-24-2
3-21. TREADLE VALVE AND BRAKE CONTROLS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5
PARKING (SPRING) BRAKES WON'T RELEASE (Cont)
a
If test gage indication differs from AIR PRESS gage indication by more than 10 psi, repair or
replace emergency quick release valve (para 3-24b).
b
If test pressure gage indication is within 10 psi of AIR PRESS gage indication, troubleshoot rear
axle brakes (para 2-46, Malfunction 12).
6
PARKING (SPRING) BRAKE WON'T APPLY
Step 1
Pull up PARKING BRAKE valve fully.
Open drain cock on service air reservoir.
Loosen fitting at hose connecting emergency port of rear axle brake air chamber to emergency
quick release valve.
WARNING
Wear safety glasses, and stand clear of loosened air hose fitting High pressure can propel debris at high
speed, causing eye injury or blindness.
a
If air discharges from loosened fitting, repair or replace emergency quick release valve (para 3-
24b).
b
If air does not discharge from loosened fitting, proceed to step 2 below.
Step 2
Close drain cock on service air reservoir.
Start engine and allow air system to build to at least 60 psi pressure.
Pull up PARKING BRAKE valve fully.
Loosen fitting at hose connecting emergency port of rear axle brake air chamber to emergency
quick release valve.
WARNING
Wear safety glasses, and stand clear of loosened air hose fitting High pressure can propel debris at high
speed, causing eye injury or blindness.
a
If air discharges from loosened fitting, repair or replace PARKING BRAKE valve (para 3-24a).
b
If air does not discharge from loosened fitting, repair rear axle brake air chambers (para 2-51d(l)
or 2-51d(2)).
3-157
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