total noob have a brake piston question

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4/8/2018 4:44 AM
Edited Date/Time: 4/8/2018 6:19 AM

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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4/8/2018 9:44 AM

One would think its to lessen the effect of heat transfer from the brake pads in an attempt not to boil the brake fluid.

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4/9/2018 3:08 PM

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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