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The Evolution Of Brake Pad Friction Materials(2)

[Catalog:News] [Date:2021-6-18] [Hits:] [Return]

Twenty years ago, some ceramic brake pad lines got a bad reputation for pedal pulsation. The issue was not the friction material, but the reconditioning of the rotor. Often, the rotor was not refinished properly, and the transfer layer was not consistent across the entire surface of the rotor. Also, just replacing the pads often lead to the contamination of the new ceramic brake pads due to incompatibility of the transfer layer material.

Semi-Metallics

In the first part of the 20th century, friction materials were woven with asbestos fibers. The materials were sold in rolls and trimmed to fit drum brake shoes. As material engineers improved resins, they could ditch the woven materials and make a better brake material called a semi-metallic. These materials still had asbestos content, but the ability to mold and bond a friction material to a shoe or backing plate had a definite advantage.