SPRING BRAKES WILL NOT RELEASE CONTINUED

TM 9-2320-270-20-1

TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

59. SPRING BRAKES WILL NOT RELEASE CONTINUED.

Step 5.

Check double check valve (1) for damage or leaks by listening for hissing or us

ing soap solution and watching for bubbles (page 4-1).

If valve is damaged or leaking, replace (page 4-796), or notify direct

support maintenance for repair.

Check rear axle relay valve (2) for damage or leaks by listening for hissing or

Step 6.

by using soap solution and watching for bubbles (page 4-1).

If relay valve is damaged or leaking, replace (page 4-785), or notify

direct support maintenance for repair.

Check spring brake valve (3) for damage or leaks by listening for hissing or using

Step 7.

soap solution and watching for bubbles (page 4-1).

If valve is damaged or leaking, replace (page 4-806), or notify direct

support maintenance for repair.

Check hose no. 612 from parking brake hand valve (4) in cab to spring brake

Step 8.

valve (3) for damage or leaks by listening for hissing or using soap solution

and watching for bubbles (page 4-1).

If hose is damaged or leaking, replace or repair (4-609).

Check hose no. 622 from spring brake valve (3) to double check valve (1) for

Step 9.

damage or leaks by listening for hissing or using soap solution and watching

for bubbles (page 4-1).

a. If hose is damaged or leaking, repair or replace (page 4-609).

b. If all spring brakes still will not release, notify direct support

maintenance.

TA239723

3-136