Author Topic: Phenolic Brake Pistons  (Read 942 times)

Offline Nurse Julie

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Phenolic Brake Pistons
« on: September 19, 2019, 08:06:54 PM »
Has anyone ever heard of brake pistons made from Phenolic, or is it just me that has never heard of them?

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« Last Edit: September 19, 2019, 08:45:59 PM by Nurse Julie »
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Offline hairygit

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Re: Phenolic Brake Pustons
« Reply #1 on: September 19, 2019, 08:24:04 PM »
Yep, phenolic resin, there was a guy on the U.S. Site used to machine down GM car brake pistons to fit our Honda's, synthetic plastic, doesn't corrode, so should never seize!

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Offline Nurse Julie

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Re: Phenolic Brake Pistons
« Reply #2 on: September 19, 2019, 08:50:12 PM »
Ah, ok. There is a chap selling them in USA and says they will last forever, will not transfer heat from the pad to the fluid and are a fraction of the weight. $44 though + post.
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Offline Woodside

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Re: Phenolic Brake Pistons
« Reply #3 on: September 19, 2019, 08:51:35 PM »
Is that the same stuff they also made sprockets out of

Offline mike the bike

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Re: Phenolic Brake Pistons
« Reply #4 on: September 19, 2019, 09:09:49 PM »
And they don't expand ad much as metal.
Where's that 10mm socket got to?

Offline K2-K6

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Re: Phenolic Brake Pistons
« Reply #5 on: September 19, 2019, 09:18:10 PM »
Is that the same stuff they also made sprockets out of

I think so. Phenolic resin bonded cotton weave.  Coarse weave for strength like above,  fine weave gives more machinability and precision like the brake pistons.

Also all the brown coloured circuit boards are generally made of the same. Often called "mica"


Offline mike the bike

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Re: Phenolic Brake Pistons
« Reply #6 on: September 20, 2019, 07:16:46 PM »
 PCBs are either fibre glass or SRBP;  synthetic resin bonded paper. Not to be confused with the cotton filled stuff that sprockets are made of.
Where's that 10mm socket got to?

 

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