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4C-2 REAR BRAKE
DRUM BRAKE
This drum brake assembly is a leading/trailing shoe
design.
Both brake shoes are held against the wheel cylinder
pistons by the lower return spring and the fixed anchor
plate near the lower return spring. When the brakes
are applied, the wheel cylinder pistons move both
shoes out to contact the drum. With forward wheel
rotation, the forward brake shoe will wrap into the drum
and become selt-energized. With reverse wheel
rotation, brake shoes is transferred to the anchor plate
through the braking plate to the axle flange.
Adjustment is automatic and occurs on any service
brake application. Do not switch the position of shoes
that have been in service, as this may render the self-
adjustment feature inoperative and result in increased
pedal travel.
The brake drum must have high abrasion resistance,
heatproof, high stiffness, fatigue stiffness and strength
enough not to make any deformation. The temperature
of the drum surface comes up to 500 - 700 °C on brake
operation by the friction with the lining. When the
temperature of the drum surface continues to keep high,
the friction coefficient goes down and the 'fade
development' occurs. When the brake is applied often
on the hill, any accident may be occur.
DESCRIPTION AND OPERATION
YAD4C010
WHEEL CYLINDER
Both wheel cylinder diameters are same in order to
balance the friction forces of both shoes.
The hydraulic pressure from the master cylinder is
provided to the wheel cylinder and the piston in the
wheel cylinder allows to push both shoes toward the
drum resulted in generating the braking force.
1 Cylinder Housing
2 Boot
3 Spring
4 Piston Cup
5 Piston
6 Air Bleeder
BRAKE LINING
The brake lining is installed with the brake shoe and
pushed toward the drum for applying the brake pedal.
Thus, lining must have high-heat tolerance, abrasion
resistance and high friction coefficient.
Brake Lining and Drum Clearance Automatic
Control System
If the lining's wear is excessive, the piston moves to
long distance and the pedal travel increases. The
clearance between the drum and the brake lining
should be adjusted.
Generally the drum brake must be adjusted regularly
and thus the clearance automatic control system
enables to adjust the clearance between the brake
lining and the drum resulting from brake lining wear.
YAD4C020
1 Cylinder Housing
2 Boot
3 Spring
4 Piston Cup
5 Piston
6 Air Bleeder
SSANGYONG Y200
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