Old 06-18-19, 06:15 AM
- Soli Deo Gloria -
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Originally Posted by Litespeedlouie View Post
Some auto brake pads do have 2 or more sections, like these Bosch:

But I don't know why exactly - water/debris/brake dust diversion? vibration/noise control? better conformity/grabbing of the disc? marketing BS?
Automotive pads sometimes have grooves to prevent brake fade caused by outgassing...

The dominant mechanism causing brake fade is this thermal degradation of the phenolic resins and other materials in the friction lining, which create a film of gas at the pad-rotor interface and effectively causes the brake pad to skid off the disc. As these gasses build up at the pad-rotor interface, they produce an appreciable backpressure which creates an opposing force to the brake caliper that is trying to hold the pads against the rotor. If there is no way for the gasses to escape, the opposing force as a result of the outgassing can become large enough to prize the pads away from the rotor, reducing the area of pad in contact with the rotor and thus reducing braking power (i.e. brake fade).

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