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What is the size of the original brake discs for the Audi S3?

1 Answers

JulietLee

07/29/25 6:07pm

The original brake discs for the Audi S3 are 345mm in size. Introduction to brake discs: A brake disc is a round disc that rotates when the car moves. The brake caliper clamps the brake disc to generate braking force, slowing down or stopping the car when the brakes are applied. Brake discs provide effective braking performance and are easier to maintain compared to drum brakes. Function of brake discs: Brake discs are used for braking, with the braking force coming from the brake caliper. Typically, standard brake calipers have a fixed inner piston pump, while the outer part is a clamp-like structure. The inner brake pad is fixed to the piston pump, and the outer brake pad is fixed to the outer part of the caliper. The piston is pushed by the pressure from the brake fluid line, moving the inner brake pad, while the reaction force pulls the caliper, bringing the outer brake pad inward. Both pads press against the brake disc, generating braking force through friction between the disc and the pads. In this process, the piston is actuated by brake fluid, also known as hydraulic oil.

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