total noob have a brake piston question

TOMPPIX
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TOMPPIX
Edited Date/Time 4/9/2018 3:08pm
so i recently took off my wheels to get the tires changed and i found out that the white plastic on the brake piston is in pieces so my question is, why is that plastic thing even there and what does it do?
i have been riding my bike in the winter and the rear brakes are working.
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Frank
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Frank 4/8/2018 9:44am
4/8/2018 9:44am
One would think its to lessen the effect of heat transfer from the brake pads in an attempt not to boil the brake fluid.
harescrambled
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harescrambled 4/9/2018 3:08pm
4/9/2018 3:08pm
Frank wrote:
One would think its to lessen the effect of heat transfer from the brake pads in an attempt not to boil the brake fluid.
Correct....it's an insulator.

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