TM 9-2320-209-10-1
m. Brake System. The brake system (fig. 2-17) includes the service brakes and a hand-
brake. The compressed air system is covered here since it is part of the brake system.
(1) The service brake system, is an air-hydraulic system made up of a master
cylinder, air-hydraulic cylinder, individual hydraulic wheel cylinders, an air compressor,
air reservoirs, air lines, hydraulic lines and linkage, and trailer brake connections and
controls. The master cylinder contains hydraulic fluid. Pressure on the brake pedal is
transmitted to the air-hydraulic cylinder. The air-hydraulic cylinder increases pressure
to the wheel cylinders. The wheel cylinders expand and press the brake shoes against the
drum to slow or stop the truck.
(2) The handbrake system consists of a brake drum, mounted on the rear output
shaft of the transfer, and inner and outer brakeshoes operated by a single shoe lever. A
cable attached to the brake shoe lever runs through a protective casing to the handbrake
lever at the left of the driver's seat.
(3) The compressed air system is used to supply air to the air-hydraulic cylinder,
windshield wiper motors, and trailer airbrakes. This system can also be used in an emer-
gency to clean the air cleaner and inflate tires. When air pressure in the air reservoir tanks
is low, a buzzer is set off in the driver's compartment to warn the operator.
Master cylinder
7.
1.
Brake pedal
Air hydraulic master cylinder
8.
2.
Air reservoir tanks
9.
Service brake shoe
Brake lines
3.
10.
Linkage
Trailer brake connection
4.
11.
5.
Wheel cylinder
6.
Handbrake assembly