Working Principle of Disc Brakes

1 Answers
CalebLee
07/30/25 7:10am
Here is an introduction to the working principle of disc brakes: 1. The hydraulic fluid is pressed into the inner and outer wheel cylinders, and the pistons press the two brake pads against the brake disc under hydraulic pressure, generating frictional torque to achieve braking. At this time, the edge of the rectangular rubber seal ring in the wheel cylinder groove undergoes slight elastic deformation due to the friction force of the piston. 2. When the brake is released, the pistons and brake pads return to their original positions by the elastic force of the seal ring and the spring. 3. The deformation of the rectangular seal ring edge is minimal. When not braking, the gap between the friction pad and the disc is only about 0.1mm on each side, which is sufficient to ensure the release of braking. Additionally, since the brake disc expands slightly when heated, its thickness changes minimally, preventing the occurrence of 'drag' phenomenon. 4. Besides sealing, the rectangular rubber seal ring also functions to return the piston and automatically adjust the gap. If the wear between the friction pad of the brake pad and the disc increases, the piston can continue to move after the seal ring deformation reaches its limit during braking, until the friction pad presses firmly against the brake disc.
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