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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > E92 Brake Piston Material?



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      03-29-2013, 01:59 PM   #1
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E92 Brake Piston Material?

Please reply with the material used for the brake pistons in E92 calipers.

Is the piston metal or fibrous like some newer designs?

Is there a source for new pistons - most parts suppliers I have searched show only gaskets and dust covers for rebuilds!

Steve
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      03-30-2013, 08:47 AM   #2
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I'd bet the piston is metal.

The P/N shows the seal, piston, and dust cover:

10 REPAIR SET BRAKE CALIPER 2 34116769090 $25.42

This P/N fits the E92 328 and 335. This info is from RealOEM.com
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      03-30-2013, 07:19 PM   #3
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10 does not include the pistons

when i pulled my pads off, the piston seemed to be metal, probably steel
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      04-12-2013, 06:28 PM   #4
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Thanks for the info. I was hoping BMW would have changed to newer material that doesn't rust. Anyway, I now know - thanks for your wisdom!
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      04-14-2013, 01:38 AM   #5
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They made stainless steel replacement pistons for E36 race cars back in the day, but generally you can do better with special coatings now.

Xylar coating on a forged steel piston will not rust ( I do not know if they are factory coated, but that is what you should do if you want no rust )
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