Drum brake systems work by using hydraulic pressure to press a
pad against the brake drum to slow the vehicle. When the brake pedal
is pressed, it acts upon the piston in the master cylinder which
sends pressure via the brake lines to the wheel cylinders inside
the brake drum. The shoe-to-drum friction stops the wheel from turning.
Brake Drum
The brake drum is a heavy flat-topped cylinder, which is usually
located between the wheel rim and the drive wheel. When the brakes
are applied, the friction material of the brake shoes is forced into
contact with the brake drum to slow the rotation of the wheels.
Wheel Cylinder
The wheel cylinder is a cylinder that contains pistons which use
hydraulic force from the master cylinder to push the brake pads against
the brake drum.
Brake Shoe
The brake shoe holds the brake lining and is used to force the
lining against the drum when the brake is depressed.
Master Cylinder
The master cylinder moves brake fluid under pressure to rest of
the braking system.
Brake Pedal
The brake pedal works as a lever to apply pressure against the
master cylinder.
