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 61 of 400
TM 9-2320-283-13&P
0010
0010-3
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. Notify Field Maintenance to check brake chamber.
3. Notify Field Maintenance to check brake shoes for oil contamination and replace hub seal
if necessary.
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. Notify Field Maintenance to check 30-amp and 5-amp fuses on ABS ECU harness.
2. Notify Field Maintenance to check ABS warning light.
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. Notify Field Maintenance to check wheel sensors and troubleshoot ABS as necessary.
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
Notify Field Maintenance to repair or replace leaking or damaged air tubes, hoses, or valves.
SYMPTOM
Air pressure gauge indicates more than 120 psi (8.3 bar).
MALFUNCTION
Damaged pressure release governor or un-loader valve.
CORRECTIVE ACTION
Notify Field Maintenance to check operation of valves.
TROUBLESHOOTING–CONTINUED
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