TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 210 of 1313
PARKING BRAKE SYSTEM OPERATION
A mechanical and air-actuated brake system performs the following for all vehicles covered in this manual:
1.
Keeps vehicle from rolling once it has stopped.
2.
Slows down or stops vehicle movement.
3.
Provides emergency stopping if there is a complete air system failure.
The mechanical brake system is covered below. The compressed air function of the brake system will be covered
in a following paragraph. Major components of the parking brake system are:
A. PARKING BRAKE CONTROL LEVER
- Is positioned up to engage parking brake; down to disengage
parking brake.
B. PARKING BRAKE CONTROL LEVER ADJUSTING KNOB
- Permits operator to make minor tension
adjustment of parking brake.
C. PARKING BRAKE CABLE
- Links parking brake control lever to brake shoe lever.
D. BRAKE SHOE LEVER
- Lever turns cam which pushes brake shoe against drum.
E. PARKING BRAKE ADJUSTING NUT
- Permits major tension adjustment between parking brake lever
and brake shoes.
F. PARKING BRAKE WARNING LIGHT
- Illuminates when parking brake is engaged.
A
B
E
D
C
F
G0016DAA
Figure 4.
Parking Brake System Components.
TM 9-2320-272-23-1
0003
0003-5
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