E92 Brake Piston Material?

2002 · 03-29-2013, 12:59 PM

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

Efthreeoh · 03-30-2013, 07:47 AM

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

BillionPa · 03-30-2013, 06:19 PM

10 does not include the pistons

when i pulled my pads off, the piston seemed to be metal, probably steel

2002 · 04-12-2013, 05:28 PM

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!

BillionPa · 04-14-2013, 12:38 AM

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 )

03-29-2013, 12:59 PM	#1
2002 Private 20 Rep 77 Posts Drives: 2009 BMW 328i E92 Coupé Join Date: Oct 2012 Location: Santa Rosa, CA iTrader: (0)	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, 07:47 AM	#2
Efthreeoh General 17315 Rep 18,737 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	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 Attached Images
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03-30-2013, 06:19 PM	#3
BillionPa Second Lieutenant 2 Rep 288 Posts Drives: 335i Join Date: Feb 2013 Location: USA iTrader: (0)	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, 05:28 PM	#4
2002 Private 20 Rep 77 Posts Drives: 2009 BMW 328i E92 Coupé Join Date: Oct 2012 Location: Santa Rosa, CA iTrader: (0)	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, 12:38 AM	#5
BillionPa Second Lieutenant 2 Rep 288 Posts Drives: 335i Join Date: Feb 2013 Location: USA iTrader: (0)	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 )
	Appreciate 0 Quote