Please Help !! Brake System Probs

[Vince@Meanstreets]

sounds like a master issue if you keep getting air from the master port...we get this alot if you depress the brake pedal all the way down on a dry or on an old master while bleeding. once you mess up the inner seal its trashed.

[Apogee]

Sounds like air...probably not what you want to hear. What did you do to bench bleed your master cylinder and how did you confirm that it was fully bleed? I normally plug both outlet ports and then stroke the piston...if it moves further than 1/8 to 3/16 inch before hydraulically locking and feels spongy, then you still have air in your MC. If you can get a firm pedal and it doesn't sink under steady pressure, then the MC is okay 99% of the time.

You didn't specify bore size, but that shouldn't keep you from being able to bleed the system. The rear C4 calipers have 45mm pistons, same as a C5/C6 setup, so while the caliper bodies may be small, they actually should work quite well assuming a Brembo 4-piston caliper with a piston area somewhere around 4 square inches.

Tobin
KORE3