TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 48 of 481
TM 9-2320-272-10
1-31
1-17. CONTROL SYSTEM OPERATION (Contd)
c. 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:
PARKING BRAKE WARNING LIGHT
– Illuminates when parking brake is
engaged.
PARKING BRAKE CONTROL LEVER
– Is positioned up to engage
parking brake and down to disengage parking brake.
PARKING BRAKE CONTROL LEVER ADJUSTING KNOB
– Permits
operator to make minor tension adjustment of parking brake.
PARKING BRAKE CABLE
– Links parking brake lever to brakeshoe lever.
BRAKESHOE LEVER
– Lever turns cam which pushes brakeshoes against
drum.
PARKING BRAKE ADJUSTING NU
T – Permits major tension adjustment
between parking brake lever and brakeshoes.
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K
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