PARKING (SPRING) BRAKES WON'T RELEASE

TM 9-2320-285-24-1

2-47.

AIR BRAKE SYSTEM TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

5. PARKING (SPRING) BRAKES WON'T RELEASE

Step 1.

Check AIR PRESS gage for minimum indication of 60 psi.

a. If indication is less than 60 psi, refer to Malfunction 4 above.

b. If indication is at least 60 psi, go to step 2 below.

Step 2.

Check if PARKING BRAKE valve is pushed down.

a. If PARKING BRAKE valve is up, push down.

b. If PARKING BRAKE valve is pushed down, go to step 3 below.

Step 3.

With AIR PRESS gage reading 60 psi minimum and PARKING BRAKE valve pushed down, check

air brake system lines and fittings for air leaks.

a. If line is leaking air, replace (para 2-51a). If fitting is leaking air, tighten. If fitting leaks after

tightening, replace (para 2-51a).

b. If are leaks are not seen, notify direct support maintenance.

2-48.

AIR COMPRESSOR TROUBLESHOOTING

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. PRESSURE TOO HIGH, OR AIR COMPRESSOR WON'T CUT OUT

Perform air compressor governor adjustment (para 2-52d).

a. If governor adjusts for cut out at 118-120 psi pressure, and cut in at 100-102 psi pressure, no

further action required.

b. If governor won't adjust, notify direct support maintenance.

2. PRESSURE BUILDS UP SLOWLY

Check for clogged air strainer filter element.

a. If filter element is clogged, clean or replace (para 2-52b).

b. If filter element is okay, refer to para 2-47, Malfunction 3.

2-535