How Drum Brakes Work?

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On the off chance that somebody make an inquiry that would you be able to drive your vehicle without brakes? Than 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. Utilization of appropriate stopping mechanism improves treatment of the vehicle to a more prominent degree. In present day vehicle 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 about this brake in detail first we should have a sharp learning about its different parts and their capacity.

Main parts

Main Parts of Drum Brake

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

  • Brake Drum:

It is a round solid metal lodging which is utilized to stop the vehicle with the assistance of 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 which reaches 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 essential shoe.

(ii) Secondary brake shoe: The shoe with little covering material is called 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 cylinder which moves outward when brake is connected and powers the brake shoe towards inward surface of the drum.

  • Return or Retracting Spring:

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

  • Self Adjuster:

It keep up the base hole between the brake shoe and drum with the goal that they don’t get in touch with one another when pedal isn’t squeezed. For the situation if the brake lining wear out, and 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 a 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 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 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 vehicle stops.
  4. As the power is expelled from the brake pedal, the withdrawing springs draws 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 wear out than 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 decreases 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 opportunity 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 functions and its primary parts, working standard with points of interest and impediments . On the off chance that you like this article than keep in mind to share.

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