SERVICE BRAKES FAIL TO APPLY OR RELEASE, OR APPLY OR RELEASE SLOWLY cont'd

TM9-2320-270-20-1

TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Check both front axle brake chambers (1) for damage, clogs, or sticking

Step 5.

If brake chambers are damaged, clogged, or sticking, clean or

replace (page 4-686).

Check both front brakedrums (2) and brakeshoes (3) for damage or foreign

Step 6.

material (page 2-35).

If brakedrums or shoes are damaged or dirty, Replace, clean (page

4-893) or (page 4-610), or notify direct support maintenance for

repair.

Check air line no. 633 from reservoir (4) to pusher axle relay valve (5),

Step 7.

and air line no. 536 from reservoir to tandem axle relay valve (6) for

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

watching for bubbles (page 4-1).

If lines are damaged or leaking, replace or repair (page 4-609).

Check pusher axle relay valve (5) and rear axle relay valve (6) for damage,

Step 8.

leaks, or clogged exhaust ports (page 4-1).

If either relay valve is damaged, leaking or clogged, clean or

replace (page 4-779 and page 4-785).

Check hoses from pusher axle relay valve (5) to pusher axle brake cham-

Step 9.

bers (7) for damage or leaks by listening for hissing or by using mild

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

If hoses are damaged or leaking, repair or replace hoses

(page 4-609).

Check four pusher axle brake chambers (7) for damage, clogs, or sticking

Step 10.

If brake chambers are damaged, clogged, or sticking, clean or

replace (page 4-692).

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