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Old 05-28-2011, 04:25 AM   #1
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Plastic Pistons

I read in a local forum, of brake calipers available with plastic pistons in them. Anybody else ever come across these before?

I'm thinking they would solve seizing issues, due to moisture in the brake lines.

Thoughts anybody?

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Old 05-28-2011, 09:55 AM   #2
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Phenolic pistons have been around a while. As you said they won't corrode, have better heat properties (don't transfer as much heat to the brake fluid), and are lighter. I guess if you have a track car or something where every bit of weight counts them being lighter matters.

I JUST bought some new calipers like 5 min ago, waiting to pick them up in store, they are plastic/phenolic. They're cheaper, that's pretty much the best thing about them.

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Old 05-28-2011, 08:59 PM   #3
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They will cut down the seizing but not eliminate it.
You still have metal bores that can rust up and grab the pistons.

Your best bet if you have a moisture problem is to flush out the system and install new fluid. Lot cheaper then new calipers. And gets rid of the moisture.
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Old 05-29-2011, 07:17 AM   #4
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Quote:
Originally Posted by Shelby427 View Post
They will cut down the seizing but not eliminate it.
You still have metal bores that can rust up and grab the pistons.

Your best bet if you have a moisture problem is to flush out the system and install new fluid. Lot cheaper then new calipers. And gets rid of the moisture.
I agree. Around here the fluid starts to darken every year and a half or so.
That's about how often I'll do a fluid flush. I've always equated darker fluid with moisture contamination.
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