5/28/2023 0 Comments Brake caliper diagram![]() The brake drum is generally made of a special type of cast iron that is heat-conductive and wear-resistant. Levers for emergency or parking brakes and automatic brake-shoe adjusters were also added in recent years. Since all braking operations exert pressure on the backing plate, it must be strong and wear-resistant. It absorbs the torque from the braking action, and that is why the backplate is also called the “Torque Plate”. The backplate also increases the rigidity of the whole set-up, supports the housing, and protects it from foreign materials like dust and other road debris. The backing plate provides a base for the other components. Drum Brakes Partsĭrum brake components include the backing plate, brake drum, shoe, wheel cylinder, and various springs and pins. Pistons (pressure mechanism) press against the drums from the inside to generate braking force, thus making it possible to decelerate and stop the vehicle. Inside each drum are brake shoes fitted with brake linings (friction material). 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. However, drum brakes can be susceptible to heat generation, which can have an adverse effect on braking performance. A brake drum is usually made of iron, rendering it resistant to wear.ĭrum brakes have been around since 1900 when they were used on a Maybach vehicle, although the idea wasn’t patented until 1902 by Louis Renault. ![]() When the brake pedal is pressed, these shoes are pushed outwards against the inner surface of the brake drum, generating friction and so slowing the car down. The drum surrounds a set of brake shoes that are coated in materials that generate friction. 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.Ī brake drum is a cylindrical drum that is attached to the inside of a car’s wheel, and so rotates at the same speed as the wheel. ![]()
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