Drum Brake; Brake Drum; Wheel Cylinder - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

GENERAL INFORMATION
DESCRIPTION AND OPERATION

Drum Brake

This drum brake assembly is a leading/trailing shoe design.

Brake Drum

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 op-
eration by the friction with the lining. When the tempera-
ture of the drum surface continues to keep high, the fric-
tion coefficient goes down and the "fade phenomenon"
occurs. When the brake is applied often on the hill, any
accident may be occur.
The brake shoes are not fixed. When applying the brake,
the wheel cylinder pushes the primary and secondary
shoes with same force to contact the drum and linings.
The primary shoe pushes the rod under the shoe by fric-
tional force with the drum. Thus, the primary and second-
ary shoes are contacted to brake drums by pivoting the
anchors. During the straight ahead driving, The primary
shoe generates bigger braking force than the secondary
shoe. On the contrary, in the reverse driving, the second-
ary shoe generates the bigger force than the primary shoe.
If the linings are worn, the clearance between lining and
drum is automatically adjusted.
REAR BRAKE
REXTON SM - 2004.4
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.

Wheel Cylinder

Both wheel cylinder diameters are same in order to bal-
ance the friction forces of both shoes.
The hydraulic pressure from the master cylinder is pro-
vided to the wheel cylinder and the piston in the wheel
cylinder allows to push both shoes toward the drum re-
sulted in generating the braking force.
Y220_08C001
1. Cylinder housing
2. Boot
3. Spring
8C-3
Y220_08C002
4. Piston cup
5. Piston
6. Air bleed screw
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN