Master Cylinder Bore size? Mar 22, 2015 17:18:04 GMT -6 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by gentle on Mar 22, 2015 17:18:04 GMT -6 I am trying to replace my master cylinder with an aftermarket part...as far as i can tell it is 14mm bore with m10 x 1.25mm banjo threads...can anyone confirm this for me?