Drum brake is a brake that uses friction caused by a set of shoes or pads that press and grip the rotating cylinder-shaped part.
Lifting machines and other heavy earth moving machines also use drum brakes as they are very safe and secure in operation.
Advantages of drum brakes:
- less expensive to produce
- Lower frequency of maintenance due to better corrosion resistance compared to disks.
- Built-in self-energizing effect requires less input force (such as hydraulic pressure).
- Wheel cylinders are somewhat simpler to recondition compared to calipers.
- Minor weight savings, primarily from much smaller and lighter hydraulic cylinders vs. calipers.
Brake drums are mostly made of cast iron to fit in to wheel rim housing. Drum brake components include the backing plate, brake drum, shoe, wheel cylinder, and various springs and pins.