Related: What is Disc Brake? Diagram of Drum Brakesĭrum brakes are a brake system with brake drums (rotor) that rotate with the wheels. They take more time to understand, and due to the number of moving parts they contain, take longer than disc brakes to service and overhaul. Another downside of the drum brake is its relative complexity. Unlike a drilled disc brake, there’s nowhere for the water to go, so it will continue to affect braking performance until sufficient heat is generated to vaporize the water. If water gets into the drum it can end up being compressed between the brake shoe and the inside of the brake drum and will have an adverse effect on the length of time it will take a vehicle to stop. This gives the car what is termed as a ‘long pedal’ because the driver has to press it farther down to get the same braking performance.ĭrum brakes can also be susceptible to water ingress. If the drum is subjected to a long period of hard breaking the heat generated can cause the drum itself to expand, meaning that the brake shoes have to be pressed farther outwards to press against the drum’s inner surface.
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