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What is Drum Brakes?

  


What is Drum Brakes?

Drum Brakes system Consists of a pan Shaped Drum, it have two brake shoes, a backing plate and a wheel cylinder or an operating cam (mechanical linkage).A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating cylinder-shaped part called a brake drum. 

              




Function of Drum Brakes

  • BRAKES SHOES
  • BRAKE LINING
  • BACKING PLATE
  • BRAKE SPRINGS
  • BRAKE DRUM
  • LEADING SHOE AND TRAINING SHOE
  • WHEEL CYLINDER
  • SELF ADJUSTER LEVER
  • ADJUST SPRING
  • SHOE LOWER RETURN SPRING


Working

The Drum is attached to the axle or Hub flange, just inside the wheel, and it rotates directly with the wheel. The brake shoes just inside the wheel, and it Rotates directly with the wheel. the brake shoes are positioned just inside the drum and are mounted on the backing plate.the outer surface of the shoes are lined with the friction material, to increase frictional coefficient. They are anchored to the braking plate so that they can pivot into and out of contact with the drum but cannot rotate with it. This kind of brake drum is known as Internal expanding brakes.











The brake forces are transmitted from the the shoes to the anchor, to the backing plate, and then to the suspension member. and  the brake pedal is  pressed and the brake shoes are pushed outwards so that the lining is forced against the drum. This force comes from the hydraulic wheel cylinder or from the mechanical linkage of the parking brake. when the brake pedal is released, it causes the brake shoes to return to their original positions through the action of the brake springs.

Common Things

The drum brake is a traditional type of brake and was used previously on all four wheels. presently, they are mostly used on the rear wheels of many vehicles.

In Earlier cars, the brake drum had a band with lining wrapped around the drum. when the brakes are applied, the band is tightened on the drum, there by applying the brakes. This type of brake was called as External Contracting Brakes.

Types of Drum Brakes

Drum brakes are three types-

  1. Leading and trailing shoe type
  2. Two leading shoe type
  3. Duo Servo type


         

  



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