Dragging Brakes

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TROUBLESHOOTING SPRING PARKING BRAKE

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TM-9-2330-326-14-P Semitrailer Tactical Drop Deck BreakBulk/Container Transporter 22-1/2 TON M871A3NSN 2330-01-458-6865 Manual

Spring Brakes Will Not Release (Normal Operation)

TM 9-2330-326-14&P

H-29. TROUBLESHOOTING SPRING PARKING BRAKE (Cont.)

Dragging Brakes

A. Service

1. Broken return spring in service section.

2. Service application air not exhausting properly or fast enough-clogged parts or defective

valves.

3. Restricted or collapsed hose or tubing.

4. Broken brake shoe return springs.

5. Camshaft linkage binding.

6. Auto slacks over-adjusting.

B. Spring Brakes

1. Leaking diaphragm or seal in spring brake section.

2. Service or parking system pressure leakage causing spring brakes to partially apply.

3. Broken return spring in spring brake section (double diaphragm type).

Service Brakes Apply When Spring Brakes Are Released By Air.

1. Leaking pushrod seal between spring brake and service section.

2. Improper plumbing.

Leak Thru Service Exhaust Ports--Spring Brakes Released By Air

Leaking pushrod seal between spring brake and service section.

H-80