TM-9-2320-283-13-P
ANTI-LOCK BRAKE SYSTEM (ABS) M915A1
TECHNICAL MANUAL; OPERATOR AND FIELD MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST (RPSTL)
AUGUST 2012
TM-9-2320-283-13-P - Page 78 of 400
TM 9-2320-283-13&P
0012
0012-14
BRAKE SYSTEM–CONTINUED
SYMPTOM
Brakes grab or pull to one side when applied.
MALFUNCTION
Brake shoes out of adjustment or brake chamber leaking or brake shoes contaminated with oil due
to leaking axle seal.
CORRECTIVE ACTION
1. Adjust slack adjusters. Refer to TM 9-2320-283-10.
2. Check brake chamber. Refer to WP 0029 and TM 9-2320-283-20.
3. Check brake shoes for oil contamination and replace hub seal if necessary. Refer to WP
0019 or WP 0020.
SYMPTOM
Modulators cannot be heard to cycle when ignition is switched on.
MALFUNCTION
No power to ABS ECU due to blown ECU harness fuses or faulty warning light.
CORRECTIVE ACTION
1. Check 30-amp and 5-amp fuses on ABS ECU harness. Refer to WP 0030.
2. Check ABS warning light. Refer to WP 0032.
SYMPTOM
One or more wheels lock (skid) when service brake is applied.
MALFUNCTION
Brake shoes out of adjustment or wheel sensor(s) contaminated or out of adjustment.
CORRECTIVE ACTION
1. Adjust slack adjusters. Refer to TM 9-2320-283-10.
2. Check tone rings and wheel sensors for contamination or incorrect air gap. Refer to
WP 0021 and WP 0022.
PNEUMATIC SYSTEM
SYMPTOM
Air pressure will not build up to operating pressure.
MALFUNCTION
Leaking or damaged air tube(s), hose(s), or valve(s).
CORRECTIVE ACTION
Repair leaks or replace leaking or damaged air tubes, hoses, or valves. Refer to
WP 0023.
DIAGNOSTIC TROUBLE CODE TABLES–CONTINUED
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