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Super Moderator
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How to measure caliper piston sizes?
I'm trying to find out what calipers I have here, they were supposedly from a 993 C4 rear. The pistons however seem to measure about 31/32 and 36/37 mm across.
From previous posts the 993 C4 rear was supposed to have 2x30 and 2x28 pistons... These are definitely not that, unless I am way off measurements.. More likely they are the 993TT rear calipers which used the 2x30 and 2x36 pistons? How do I measure the pistons to be sure?
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Chris ---------------------------------------------- 1996 993 RS Replica 2023 KTM 890 Adventure R 1971 Norton 750 Commando Alcon Brake Kits |
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Moderator
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Here is a pic of a typical piston, you measure the diameter at the widest part;
![]() Here is a closeup of the new style seal and piston installed in a caliper; ![]() In the rear the 993 tt uses 28/28 pistons the 993RS which is very rare here in North America uses 30/36, all other 993 C2/4 use 30/28 all other 964 C2/4/RSA use 30/28, all 964 T/TL use 30/34, all 964 RS use 30/34
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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