TM-9-2330-202-13-P
TRAILER, CARGO, 3/4-TON, 2-WHEEL: M101A1, M101A2 AND M101A3; TRAILER, CHASSIS, 3/4-TON, 2-WHEEL: M116A1 AND M116A2; TRAILER, CHASSIS, 1-TON, 2-WHEEL: M116A3
TECHNICAL MANUAL; OPERATOR AND FIELD MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
DECEMBER 2011
TM-9-2330-202-13-P - Page 49 of 552
OPERATOR MAINTENANCE
THEORY OF OPERATION
Hydraulic Brake System (M101A2, M101A3, M116A2, and M116A3)
1.
The handbrake levers are located at the front corners of the frame. Adjustment of one of these levers is
made at the lever itself.
2.
Brakes are applied automatically by the hydraulic brake system when the prime mover slows or stops, or
when the trailer breaks away from the prime mover.
3.
The major components of the hydraulic brake system and their functions are as follows:
a.
Hydraulic Brake Actuator Assembly. This assembly transmits the braking forces of the prime mover
to the trailer by inertia. It consists of a drawbar coupler, master cylinder, breakaway chain and lever,
and leaf spring.
b.
Drawbar Coupler. The drawbar coupler attaches to the prime mover and controls the master
cylinder. When the prime mover goes forward, the drawbar coupler is pulled and the brakes are
released. When the prime mover slows down, the trailer pushes the drawbar ring into the prime
mover and applies the brakes.
c.
Master Cylinder. The master cylinder changes the mechanical motion of the drawbar coupler and
breakaway lever into hydraulic pressure. It has a built-in shock absorber to prevent jerky drawbar
coupler movement. The shock absorber prevents hydraulic pressure from building up when the
prime mover backs up.
d.
Breakaway Chain. The breakaway chain is attached to the prime mover. If the trailer breaks away
from the prime mover, the breakaway chain will pull up on the breakaway lever and apply the brakes.
BREAKWAY
CHAIN
HYDRAULIC BRAKE
ACTUATOR ASSEMBLY
DRAWBAR
COUPLER
MASTER
CYLINDER
LEAF
SPRING
BRAKES APPLIED
BRAKES RELEASED
BREAKAWAY
LEVER
M116_M101_014
Figure 1.
Major Components of Hydraulic Brake System.
TM 9-2330-202-13&P
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