When brakes are applied, increased hydraulic pressure travels
through the Brake Lines and
Hoses (A) into the Wheel Cylinder (B) where two pistons are forced
outwards in opposite directions. These pistons force the Brake
Shoes (C) against the inside surface of the rotating
Brake Drum (D) which is located behind the wheel assembly. The
frictional contact of the Brake
Shoes slows and then stops the drum. The brake shoe mechanism
is mounted on a Backing Plate (E). Several Brake Springs (F) retract
shoes and pistons after braking has ceased. The Self Adjuster
mechanism (G) compensates for normal shoe wear by automatically
adjusting brake shoes against the brake drum as the pads wear
down.
A. Brake Lines
B. Wheel Cylinder
C. Brake Shoes
D. Brake Drum
E. Backing Plate
F. Retracting Springs
G. Self Adjuster