How Drum Brakes Work?

 On the off chance that somebody makes an inquiry that would you be able to drive your vehicle without brakes? Then what will your answer, clearly No. Driving a vehicle without brakes is incomprehensible. Brakes are vital for halting a vehicle and drive securely out and about. The utilization of an appropriate stopping mechanism improves the treatment of the vehicle to a more prominent degree. In the present-day vehicles, the drum brakes are for the most part introduced at back wheels. There are diverse kinds of brakes accessible in the market. In any case, here I will talk about just about Drum brakes and how it functions.

To comprehend this brake in detail first we should have sharp learning about its different parts and their capacity.

Main Parts

drum brake

The entire get together of the drum brake is fitted to the backplate of the wheel. The backplate stays stationary and it doesn’t turn with the wheel.

  • Brake Drum:

It is a round solid metal lodging that is utilized to stop the vehicle with the assistance of a brake shoe. The drum brake is dashed to the center point of the wheel. It pivots with the center point.

  • Brake Shoe:
It is the frictional piece of the drum brake, without it the working of the brake is preposterous. The brake shoe has brake lining at its external bend. It is the brake fixing that reaches the brake drum amid the halting of the vehicle. It is of two sorts
(I) Primary Brake Shoe: The shoe having vast coating material is called as an essential shoe.

(ii) Secondary brake shoe: The shoe with little covering material is called an optional shoe.

  • Wheel Cylinder:

It is utilized to drive the brake shoe outward to apply the brake. The wheel barrel is associated with the ace chamber. It contains a cylinder that moves outward when the brake is connected and powers the brake shoe towards the inward surface of the drum.

  • Return or Retracting Spring:

It is utilized to withdraw the brake shoe after the brake is connected. Two return springs are there in the drum brake, one for the essential shoe, and another one is for the auxiliary shoe.

  • Self Adjuster:
It keeps up the base hole between the brake shoe and drum with the goal that they don’t get in touch with one another when the pedal isn’t squeezed. For the situation, if the brake lining wears out, and the hole increments in the middle of the shoe and drum, It can be balanced again to keep up the hole among shoe and drum inward surface. when it is balanced it keeps up similar jabber amid the brake working without anyone else.

Working Principle

The brake shoe is permitted to grow in both the bearing. As the brake coating of the shoe contacts the inward surface of the drum, rubbing is produced in the middle of the brake shoe and drum and prevents the vehicle from moving.

Working of Drum Brakes

  1. As the brake pedal is squeezed, it packs the liquid in the ace chamber and permits the cylinder of the wheel barrel to extend outward.
  2. The outward movement of the cylinder of the wheel chamber powers the brake shoe outward against the brake drum.
  3. As the brake shoe lining contacts the internal surface of the drum, and because of the rubbing created in the middle of the brake shoe and drum, the movement of the wheel diminishes and the vehicle stops.
  4. As the power is expelled from the brake pedal, the withdrawing springs draw the brake shoe internal, and the contact between the grinding covering and drum finished. Presently again the brake is prepared to apply.
  5. A self-modifying screw is available at the base, which is utilized to keep up a base hole between the drum and brake shoe. At the point when the covering of the brake shoe is worn out then the hole between the drum and brake shoe increments, around then the agent is balanced again to keep up the base hole.


They are self invigorating stopping mechanism. It implies they are intended to work without anyone else’s input.
It is less expensive than the plate stopping mechanism.


  1. Warming issue: Since the grinding zone is completely secured by coating, so warm is created amid the grating isn’t permitted to go out in the climate. This may decrease the braking effectiveness of the vehicle.
  2. The drum brakes won’t work appropriately on the off chance that it gets wet in water. This is on the grounds that water sets aside longer opportunities to turn out from the drum. the water decreases the grinding in the middle of the brake covering and drum.

In this article, we have found out about how drum brakes function and its primary parts, working standard with points of interest and impediments. On the off chance that you like this article then keep in mind to share.

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