R32 Brake Master Cylinders

[kiwi32]

I have just finished putting a set of r33 turbo brakes onto an r32 gts.

The brakes work very well but the pedal is a bit soft and has no feel to it. What i need to know is do i need a master cyliner off of an r33 as well to fix the problem, If the problem is caused by a mis match of master cylinder to callipers. Has anyone else done this if so, how well do your brakes work?.

[djr81]

I have just finished putting a set of r33 turbo brakes onto an r32 gts.

The brakes work very well but the pedal is a bit soft and has no feel to it. What i need to know is do i need a master cyliner off of an r33 as well to fix the problem, If the problem is caused by a mis match of master cylinder to callipers. Has anyone else done this if so, how well do your brakes work?.

What you need do is compare the piston area of the calipers of the new set up with that of the old. If it is much larger you will get a longer pedal travel, but not necessarilly a spongy pedal. The two are different things. Sponginess is usually caused by air in the system, so have the brakes been bled properly?

But yes a larger bore on the master cylinder will give you a shorter, harder pedal & arguably one with more feel.

[kiwi32]

We have bleed the brakes twice now and replaced the brake fluid so i would think all the air would be gone. It is more that the pedal has a longer travel than is spongy.

[specialk]

is the r33 gtst and r32 gtr master cylinder the same?

[djr81]

R32 GTS-T: 25.4mm dia

R33 GTS-T: 23.8mm dia

R32 GT-R (Sumitomo): 25.4mm

R32 GT-R (Brembo): 26.9mm

Not sure about the N/A Master cylinder sizes, however, nor why the R32 T has a larger bore than the 33 T.

[kiwi32]

Cheers for the info.

I might look into getting a r32gtst master cylinder and see how that works.

Maybe the r33 has a different pivot point on the pedal compared to the r32.