TM-9-2320-283-20-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3
DECEMBER 1983
TM-9-2320-283-20-1 - Page 434 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
115.
PARK BRAKES WILL NOT APPLY.
Step 1.
Inspect vent on park brake valve for damage or clogging.
Clean vent or replace valve (para 3-171).
Step 2.
Check air brake chambers for proper position of caging bolt.
Uncage bolt.
(Refer to TM 9-2320-283-10).
116.
SERVICE BRAKES ARE WEAK OR SLOW WORKING (ALL WHEELS).
Step 1.
Check for low reservoir pressure.
Pressure should not be below 70 lbs.
(Buzzer sounds at pressure below
70 lbs).
See malfunction 106.
Step 2.
Check service air lines for damage and leakage using a soap solution.
Tighten loose connections and replace damaged lines.
Step 3.
Check brake linings and adjustment.
Replace brake shoes and/or adjust as necessary (para 3-157 and 3-159).
117.
FRONT SERVICE BRAKES ARE WEAK OR SLOW WORKING.
Step 1.
Check air lines between brake pedal valve and front brake chambers for damage and leakage using a soap
solution.
Tighten loose connections and replace damaged lines.
Step 2.
Check the ratio valve for damage and leakage using a soap solution.
Replace defective ratio valve (para 3-181).
2-308
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