zakxr8 Member 14 Member For: 17y 5m 2d Posted 11/04/08 02:59 AM Share Posted 11/04/08 02:59 AM HiA brake mechanic informed me that in BF’s the FPV master cylinder is bigger than in XR8. Is this true.I have replaced my XR8 brakes, front 2 pot calliper x 322 rotors & rear 1 pot calliper x 328 rotors, with FPV (BF F6) brakes, front Brambo 4 pot x 355 cross drilled rotors & rear 1 pot calliper x 328 cross drilled rotors. Brakes work fine but the paddle is bit spongy. The brake mechanic believes that it is due to the size in master cylinder. What do you think. Link to comment Share on other sites More sharing options...
Smoke them tyres Member 557 Member For: 16y 8m 28d Gender: Male Location: Brisbane Posted 12/04/08 01:51 PM Share Posted 12/04/08 01:51 PM If the pedal is spongy, it either needs bleeding or the flexible hoses are RS. If the pedal travel is long, the master cylinder is too small. Should probably be changed for one with a 1/16" bigger piston (whatever that is in mm). Link to comment Share on other sites More sharing options...
Ninka Donating Members 1,850 Member For: 21y 8m 27d Gender: Male Location: Perth, WA Posted 12/04/08 11:17 PM Share Posted 12/04/08 11:17 PM HiA brake mechanic informed me that in BF’s the FPV master cylinder is bigger than in XR8. Is this true.I have replaced my XR8 brakes, front 2 pot calliper x 322 rotors & rear 1 pot calliper x 328 rotors, with FPV (BF F6) brakes, front Brambo 4 pot x 355 cross drilled rotors & rear 1 pot calliper x 328 cross drilled rotors. Brakes work fine but the paddle is bit spongy. The brake mechanic believes that it is due to the size in master cylinder. What do you think.Looks like the brake machanic has no idea Specs on std. BA and FPV master cylinder are IDENTICAL, and spongy brakes are a sign of trapped air and/or bad brake hoses, and has nothing to do with the size of the master cylinder. Link to comment Share on other sites More sharing options...
IEATV8S Member 354 Member For: 17y 7m 13d Gender: Male Location: Albury, NSW Posted 13/04/08 12:05 AM Share Posted 13/04/08 12:05 AM I changed mine over to 4 pots off a typhoon and had no drama. Link to comment Share on other sites More sharing options...
zakxr8 Member 14 Member For: 17y 5m 2d Posted 14/04/08 03:44 AM Author Share Posted 14/04/08 03:44 AM HiThanks for your inputs. Link to comment Share on other sites More sharing options...
ms700 Moderating Team 10,170 Member For: 21y 7m 19d Gender: Male Location: Sydney Posted 14/04/08 06:17 AM Share Posted 14/04/08 06:17 AM I changed my standards to 6 pot AP Racing brakes front, and 4 pot AP's rear, left the standard master cylinder, and the pedal is definately a long way from spongy. Link to comment Share on other sites More sharing options...
zakxr8 Member 14 Member For: 17y 5m 2d Posted 18/04/08 11:38 AM Author Share Posted 18/04/08 11:38 AM Hi allSecond full flush did the trick. Pedal has a shorter travel & at the end has very firm stopping power. Thanks for your input Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now