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Air Cooled Addict
Join Date: Aug 2007
Location: Brandon, FL
Posts: 272
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Rear brake caliper piston question
I think I have a mutant rear brake caliper piston. I'm in the process of rebuilding the brake calipers on my '84 Carrera. While aligning the pistons using my homemade 20 degree tool, I noticed that the last piston has more recess than protuberance. Kind of hard to visualize and hard to show in a photo, so I made an illustration:
This is the shape of normal piston where yellow denotes a lower section and black a higher section:  And this is the shape of my abnormal piston (again, yellow is lower than black:  Has anyone seen this before?
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Joe V '84 Schwartz 911 Carrera 3.2 '91 Specialized S-Works M2 - Gone but not forgotten '12 Trek X-Cal : American Classic - XT brakes/shifters/derailleurs - carbon goodies '13 Trek Madone 5.2 stockish |
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10-12-2009, 06:56 PM
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Max Sluiter
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That's a new one on me, try asking Bill Verberg or Eric Shea.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
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10-12-2009, 11:10 PM
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Air Cooled Addict
Join Date: Aug 2007
Location: Brandon, FL
Posts: 272
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Pictures
Flieger,
Thanks for the reply. I took some pictures to show what I'm referring to. Normal piston:  And my irregular piston:  Will this cause any issues?
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Joe V '84 Schwartz 911 Carrera 3.2 '91 Specialized S-Works M2 - Gone but not forgotten '12 Trek X-Cal : American Classic - XT brakes/shifters/derailleurs - carbon goodies '13 Trek Madone 5.2 stockish |
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10-13-2009, 04:37 AM
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Registered
Join Date: Jan 2003
Location: Burford, ON, Canada
Posts: 2,322
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I think it may cause some issues. I haven't seen many late rear calipers with the cupped pistons, but that odd one just looks wrong. Eric should have a better idea based on the number of units he has seen.
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Keeper of 356, 911, 912 & 914 databases; source for Kardex and CoA-type reports; email for info Researching 356, 911, 912 & 914 Paint codes, Engine #'s and Transmission #'s Addicted since 1975 |
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10-13-2009, 12:24 PM
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Max Sluiter
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
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10-13-2009, 07:15 PM
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1971 Porsche 911S
