TM 9-2330-390-14&P
Table 4-2. Unit Troubleshooting (Con’t).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
11. PARKING BRAKES (REAR DOLLY) DO NOT RELEASE.
l DO NOT disconnect air lines and fittings while dolly set airbrake system is
pressurized. Intervehicular air lines must be disconnected and air reservoirs drained
before air lines and fittings are disconnected. A line or fitting disconnected under
pressure may explode with great force and cause serious injury to personnel.
l Wear eye protection when working with compressed air to avoid serious eye injury.
NOTE
Refer to airbrake system schematics for assistance (see paragraph 4-74).
Step 1.
Check operation of parking brake lever. Check that lever moves freely up and down.
Replace damaged parking brake lever (see paragraph 4-69).
Step 2.
Check parking brake air supply to air reservoir and air lines between parking brake lever and rear
chamber of airbrake chambers at wheels.
Replace leaking or damaged air lines (see paragraph 4-73).
Step 3.
Check that spring in each airbrake chamber is fully released. Cage brakes (see paragraph 4-56).
If brakes cannot be caged, replace damaged airbrake chambers (see paragraph 4-61).
12. UNEVEN BRAKESHOE LINING WEAR.
Step 1.
Remove hub and brakedrum (see paragraph 4-75). Check for wear or damage to brakeshoe return
springs (see paragraph 4-57).
Replace weak or damaged brakeshoe return springs (see paragraph 4-57).
Step 2.
Check for damage to wedge assembly (see paragraph 4-60).
Replace damaged wedge assembly (see paragraph 4-60).
Step 3.
If malfunction persists, replace spider assembly with wedge brake components (see
paragraph 4-60).
Step 4.
Notify Direct Support Maintenance to check brakedrums for out-of-round.
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