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Join Date: Dec 2003
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Question Brake caliper piston diameters

Hi Everyone,
I'm trying to find info on the piston diameter of a few Porsche calipers. I already tried a search with no luck. Any help would be greatly appeciated. I'm sure this info would be useful for others in the futur too. I will post numbers I have already found. Please correct me if I'm wrong.
Thanks, Will

Rear calipers:
993 NA rear caliper piston diamter?
993 Turbo rear caliper piston diameter? 28mm/34mm
928 Turbo S rear caliper piston diameter?
986 Boxster rear caliper piston diameter?
986 Boxster S rear piston diameter?

Front calipers:
993 NA front caliper piston diamter 36mm/44mm
993 Turbo front caliper piston diameter 36mm/44mm
928 Turbo S front caliper piston diameter 36mm/44mm
986 Boxster front caliper piston diameter?
986 Boxster S front caliper piston diameter?

Old 12-27-2003, 03:39 PM
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Calling Bill Verburg, calling Bill Verburg! Question for you in the 911 Forum!

I don't know about the Boxsters but Bill has collected almost all pertinent facts about 911 brakes here on his PP web site.

TT
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Old 12-27-2003, 04:16 PM
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Thanks for the info, I'm a little confused about the big size difference in pistons for the 993RS rear(36-30) and the 993TT rear (30-28). any ideas why the big difference? Any ideas about rear piston sizes for the 928 turbo?
Thanks, Will
Old 01-02-2004, 12:30 PM
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all wheel drive, different p/v and heavier rear engine as well as different ABS calibrations

There was no 928 turbo

928S4/GT/GTS used the same type of small axial mount 30/28 as the 964
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Old 01-04-2004, 12:34 PM
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Thanks for the info Bill. Can you tell me if the 993RS rear caliper is cosmetically simillar to the 993 turbo rear? I would like to match bias and cosmetics if possible and the RS rear should be just right for my application.
Thanks, Will
Old 01-06-2004, 09:13 PM
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Yes it is. Here is a pic


and another comparing to an M and a small Brembo rear.
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Old 01-07-2004, 01:09 PM
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Great news! Now I just need to find a pair. Thanks againn.
Will

Old 01-07-2004, 05:29 PM
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