I am not a GP owner but I need some information regarding one. I have an R53 JCW that was just tuned by Bytetroniks and now I need to upgrade some of the braking system. I have upgraded to the larger front brakes and now my 1st Gen master cylinder is to small and I have a soft pedal. I have been researching the GP2 brake master cylinder and cannot find much on it. Can so,done tell me if it is the same as an R56 or is it its own part? Is there an aftermarket master cyclinder that is the same as the GP2s? Can anyone provide a part number? What I have found is part number 34336786585 but it looks like it is for all of the 2nd Gen cars.

 

Do you have the R56/R53 JCW calipers, or the R56 JCW 4 piston Brembo calipers?

R56 and R56 JCW 4 piston Brembo calipers use the same master cylinder. R56 GP2 uses a different master cylinder, ECS Tuning shows 34336857907

 

I have a GP2 and an R56 JCW. The master cylinders are different. However, I put a set of GP calipers on the JCW, and used the stock JCW master cylinder without any problems. In fact I actually prefer the feel with the JCW master cylinder, more modulation, less on/off feel.

I have a spare GP2 master cylinder sitting in my workshop. I can take pics if you want.

 

squawSkibum, I swapped in the R56/R53 JCW calipers. Thank you for the part number, I could not get it to come up for some reason.

robbo mcs, thank you for the info. That is something to consider and research on the GP2 vs JCW master cylinder. No need for photos, unless it is up for sale,

 

I liked it better with the gp2 master personally on the brakes of Gp2 6 pots (as so did many people who work with the braking system here) as it felt much better. I have tracked and daily them for many miles now and before when I had just the stock master on the Gp2 calipers, the pedal feel was a little weak and I had to push it more to the floor. I felt I could not dial in the pedal. The stock master works good for the JCW 4 pots and of course with that ecu flash which dials back the DSC and the ABS. I would flash the ecu if upgrading to the JCW 4 pot or the JCW 6 pot set up. This is only possible on the gen 2 MINIs for the ecu / BBK flash. On the GP2 6 pot brakes, I would get the GP2 master in my opinion.

The JCW 4 posts share the same as the Cooper, Cooper S stock. The Gp2 is its own beast.

https://www.northamericanmotoring.co...-cylinder.html

https://www.northamericanmotoring.co...e-massive.html

 

Did you ever successfully install the GP2 master into the first gen jcw?

im having the same problem, same scenario

cheers

 

I did not. I ended up buying a GP2.