How Drum Brake Works?

1 minuteread

Normal Braking:

When the brakes are applied, brake fluid is forced struggling from the cylinder into the wheel cylinder, which successively pushes the brake shoes into contact with the machined surface of the drum. This rubbing action reduces the rotation of the cylinder, which is coupled to the wheel. Hence the speed of the vehicle is reduced. When the pressure is released, return springs pull the shoes back to their rest position.

 

Automatic Self-Adjustment:

As the brake linings wear, the shoes must travel a greater distance to achieve the drum. In systems fitted with automatic adjusters, when space reaches a specific point, a self-adjusting mechanism automatically reacts by adjusting the remainder position of the shoes so that they’re closer to the drum.

Here, the adjusting lever rocks enough to advance the adjuster gear by one tooth. The adjuster has threads on that, sort of a bolt, so that it unscrews a bit when it turns, lengthening to fill in the gap. When the brake shoes wear a bit more, the adjuster can advance again, so it always keeps the shoes near the drum. Typically the adjusters only operate when the vehicle goes in reverse and the brakes are engaged.

 

Parking/Emergency Brake:

The parking (or emergency) brake controls the brakes through a series of steel cables that are connected to either a hand lever or a pedal. The concept is that the system is fully mechanical and completely bypasses the mechanism so that the vehicle may be dropped at a stop whether or not there’s a complete breakdown. Here the cable pulls on a lever mounted in the brake and is directly connected to the brake shoes. This has the effect of bypassing the wheel cylinder and controlling the brakes directly.

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