R33 Brake Swap

[MRO]

I am about to put a set of front and rear gtst r33 brakes on my s1 stagea. The workshop doing the work has told me to get the r33 master cylinder as well - but i am not sure whether my abs will be affected by the change. i know that some r33's came with abs and some didnt and the master cylinder was different on each one.

Has anyone done this conversion including the master cylinder swap?

Help appreciated - i will call the workshop tomorrow but wanted a second opinion

[gzzmos]

on my rsfour over in japan they put on thr r33 gtr brembos and i still got the rsfour master, if thats any help?

[darrinspencer]

I fitted R34 GTT front and rears and used the R34 master and booster. Bolted straight in and works fine on my series 2.

[unique1]

i dont think the master change is a neccessity but worthwhile for better pedal feel. Im running r34 brembos and stock rs4 master and its fine but i feel the brakes are not as good as they should be and ill change the master and see what happens. I think the stock master is just too small to effectively operate the big calipers like they should.

[Duncan]

I am running 32gtr (same size as 33gtst) with the standard master cylinder, no problems. The pistons in the standard caliper are pretty big

[Burns]

I did some research on this when I converted to AP racing 4 pots on the font and R33 GTS-t on the rear. I found that caliper piston area on the fronts was actually slightly bigger on the stock Stagea calipers than the AP's 2 big pistons verses 4 smaller ones. On the rears the piston area was the same.

I think the master cylinder on the Stagea was bigger than that on a R33 GTS-t so changing would give a softer pedal

[chook]

I put R34 Gtt front and rears on, didnt change MC, have great pedal, dont think it is necessary.