How Drum Breaks Works ?

A drum brake is one type of Breaking System which consists of hydraulic wheel cylinders, brake shoes and a brake drum.In the motor vehicle, the wheel is attached to a drum.when the friction caused by a set of shoes or pads that press against a rotating drum-shaped part called a brake drum.Totally drum encloses the entire brake mechanism to avoid dust and moisture.

In the drum breaks which consists of hydraulic wheel cylinders, brake shoes and a brake drum. The drum brake usually means a brake in which shoes press on the inner surface of the drum. When break pedal is applied which are attached to shoes press two curved brake shoes, which have a friction material lining, are forced by hydraulic wheel cylinders against the inner surface of a rotating brake drum.The magnitude of the friction force, multiplied by the radius of the drum, gives the torque tending to stop the drum, that is, the braking torque.

To drawThe retracting spring are held between the brake shoes. These retracting springs draw the shoes away from the drum when the cam is turned and moved to the release position.This total mechanism in which the shoes are mounted to rub against the inside surface of the brake drum, is called internal expanding brake. In this system, each part of the linkage must be free to move. The joints must be properly lubricated to reduce friction and wear.

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