General; System Description; Wheel Brake - Cushman 632904 Service Manual

Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
Brake
Pedal

GENERAL

System Description

NOTICE
To assure correct braking performance, all periodic mainte-
nance, inspections and procedures must be performed as indi-
cated in the Periodic Service Schedule. The brake system
must be bled whenever any part of the brake system has been
replaced.
A hydraulic system is used to actuate the front disc
brakes and the rear drum brakes. The system transmits
the power Required to activate the friction surfaces
(pads and shoes) of the braking system from the pedal
to the individual wheels.

Wheel Brake

The 160 x 30mm hydraulic brake is a leading-trailing
design. The shoes are held to the backing plate by hold-
down springs, pins, and spring retainers. The shoes are
fitted to the anchor at the bottom and secured by a lower
shoe to shoe spring. At the top, the shoe web rests on
the wheel cylinder piston. The shoes are held to the
wheel cylinder pistons by the upper shoe to shoe spring.
Part of
Frame
Torsion
Bushing
Spring
Linkage
Rod
Fig. 1 Hydraulic Brake System Components
Repair and Service Manual
Retaining Ring
Shaft
Bushing
Bellcrank
Part of
Frame
Brake light
Switch
The wheel cylinders are of the double piston design,
permitting even distribution of force to each shoe. There
are no links. Shoes rest directly on the piston ends.
Wheel cylinders incorporate external boots.
Brake adjustment is automatic. Adjustment takes place,
if needed, whenever the brakes are applied, whether
during a forward or reverse stop or when the vehicle is
stationary. Upon any brake application, the shoes move
outward contacting the drum. As the shoes move out-
ward, the automatic adjuster levers (attached to each
shoe by a pin) follow the shoe movement. The automatic
adjuster pin is smaller than the slot in the brake shoe
web; therefore, when the brakes are released, the shoes
are allowed to return slightly, providing brake shoe to
drum running clearance.
The rear brake includes a parking feature consisting of a
lever and strut. The lever is applied by a cable attached
to the parking brake lever (hand operated). The parking
brake is used to retain the vehicle when stationary. It
may also be used as an emergency brake in the event of
hydraulic system failure.
BRAKES
Master
Cylinder
Flexible
Brake
Hose
Page E-1
B
B