Ryan.G Posted June 19, 2009 Share Posted June 19, 2009 Does anyone know the piston bore size for the Uk Front and Rear Calipers? Im trying to do the Maths for my correct master cylinder sizes and need to know this ideally Ryan Quote Link to comment Share on other sites More sharing options...
Nic Posted June 19, 2009 Share Posted June 19, 2009 (edited) How exact do you need Ryan? I've no vernier calipers here but can measure with a ruler if that would suffice. Edited June 19, 2009 by Nic (see edit history) Quote Link to comment Share on other sites More sharing options...
CWD Posted June 19, 2009 Share Posted June 19, 2009 From http://www.brakeparts.co.uk/ front 42.80mm seal diameter Back 40.00mm seal diameter if you look in the correct associated parts listing and then click on the piston it gives you the spec Quote Link to comment Share on other sites More sharing options...
Nic Posted June 19, 2009 Share Posted June 19, 2009 I have a new front calipers here that I have measured (with a ruler) the piston diameter is approximately 40mm, don't have any rears in stock. Quote Link to comment Share on other sites More sharing options...
CWD Posted June 19, 2009 Share Posted June 19, 2009 The crown size (top of piston that you can see) is smaller than the actual piston (seal size) in the bore so fronts probably measure 40mm across the crown but when removed they will measure 42.8mm Quote Link to comment Share on other sites More sharing options...
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