TM 5-2420-230-10
Table 3-4. Troubleshooting Table. (Continued)
Malfunction
Test or Inspection
Corrective Action
32.
PARKING BRAKES WILL NOT RELEASE.
Step 1.
Check DUAL BRAKE PRESSURE gauge (1) to ensure it is reading between 75 and 110 psi
(517 and 758 kPa).
If DUAL BRAKE PRESSURE gauge (1) is reading between 75 and 110 psi (517 and 758 kPa),
proceed to Step 2.
Step 2.
Check air hoses for leaks, damage, or loose connections.
Tighten any loose connections found.
If leaks or damaged hoses are found, notify Unit maintenance.
Step 3.
Ensure brake chambers and slack adjusters are properly operating.
If brake chambers and slack adjusters are not properly operating, notify Unit maintenance.
33.
PARKING BRAKE WILL NOT HOLD VEHICLE.
Step 1.
Check to ensure that PARK BRAKE lever (1) locks into ON position.
If PARK BRAKE lever (1) will not lock into ON position, notify Unit maintenance.