Here are the benefits of drum brakes in cars.Īffordability: The manufacturing cost of drum brakes is lower due to the simple components and construction. It is used in modern cars, bikes and scooters. It is used in heavy vehicles (trucks, buses, etc.), cars and scooters/bikes. It is easy to repair or replace the brake pads due to the simple design. It is difficult to repair or replace the brake shoes due to the complex design.
Performance remains the same even at high temperatures. Instant response to the inputs (brake pedal). Slow response to the inputs (brake pedal). It uses disc-shaped rotors and brake callipers with brake pads. It uses a cylindrical drum and brake shoes. The below table will help you understand the key differences between disc and drum braking systems.
But there is a drastic difference when it comes to cost, design, performance and efficiency. Since the discs are exposed to air, they dissipate heat more quickly than drum brakes.ĭifference Between Drum Brake and Disc Brakeīoth drum and disc brakes work on the same principle of friction and heat. With both the brake pads pushing against the disc, the friction generated slows down the car. The pressure caused by the fluid pulls the entire calliper, and it causes the outer brake pad to rub against the disc. The pressurised fluid pushes the piston and, in turn, pushes the inner brake pad against the disc. When you press the brake pedal, the hydraulic fluid travels from the master cylinder to the calliper. Hydraulic fluid is used to transfer the inputs on the brake pedal to the brake pads. The calliper houses two brake pads on each side of the disc.
The calliper is fitted on top of the disc. The disc rotors are fitted to the wheel hub. The below points explain the working principle of a disc brake. The main components of a disc brake are a disc rotor, calliper and brake pads. However, it works on the same principle of slowing down a vehicle through friction. It is far superior to a drum brake due to its design and working mechanism. Once the brake pedal is released, the brake shoes move to the original position with the help of retaining springs.Ī disc brake refers to a braking system that uses callipers, brake pads, and a disc. The pistons push the brake shoes, which makes contact with the drum to cause friction. When you press the brake pedal, the hydraulic fluid exerts pressure on the wheel cylinder and moves the piston outwards. Hydraulic fluid is used to transmit the inputs on the brake pedal to brake shoes. The backplate holds vital components such as spring, wheel cylinder, pistons and brake shoes. The brake drum is attached to the wheel hub, and it rotates along with the wheel. Refer to the points below to understand the working principle of a drum brake. The key components of a drum brake include brake shoes, pistons, springs and a wheel cylinder. All the parts of the brake are fitted inside a drum that rotates along with the wheel. What is a Drum Brake?Ī drum brake refers to a braking system that uses a drum design on all four wheels, hence the name drum brakes. To understand it better, we explain the working mechanism of both braking systems in the following sections of this article. But when it comes to heat dissipation, the difference becomes pronounced. The basic principle of drum and disc brakes is the same. Similarly, the braking performance depends on how efficiently the heat is dissipated from the components involved in the braking system. The braking rate also depends on how well a braking system converts kinetic energy (rotation of the wheel) into heat. The rate of braking, or the rate at which the vehicle can be slowed down, depends on the vehicle's weight, applied braking force and braking surface area. This process creates heat as a byproduct. The below points will give you a better idea about the working principle of brakes.Ī brake works by applying friction/resistance to a rotating wheel, and in turn, it slows down the vehicle/brings the car to a halt. A disc and drum brake works on a common principle of friction and heat. How Do Brakes Workīefore getting into the key differences between drum brakes and disc brakes, you need to understand the basic working principle of both braking systems. In the following sections, we will elaborate on this in detail. Disc brakes offer high braking performance as they are technologically superior and advanced compared to drum brakes. The main difference between drum brakes and disc brakes is that drum brakes are cheaper compared to disc brakes.
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