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.

 

hi there,

How does it feel with gp2? I'm about to buy one for my 06’ jcw. 6 pot big brakes installed.

Thanks,

 

You say you have put 6 pot from GP2 on an R53? I was trying to figure out what I need to get that done. Any chance you can lend some helpful info or point me in the right direction? I posed a few questions in the 1st gen JCW garage forum in the R53 to R56 brake conversion thread.

 

The brakes on my GP2 are the best brakes I have ever had on a car. I have yet to worry about getting stopped with these. With that being said, I am also running braided stainless brake lines, Performance stainless front caliper pistons, W2 front pads and RBF660 brake fluid. So not really apples to apples.

 

When I had my 2004 R53 JCW it did not get the bigger brakes. I replaced them with R56 S front brakes which are exactly what the R53 JCWs had when you got a JCW from the factory in the later years. It was a direct swap. I added the stainless brake lines to both front and back. It did help the braking but because the brakes were bigger it apparently needed more fluid and that’s why I got the soft pedal. From what I remember, doing the research numerous years ago, the GP2 reservoir was a direct bolt on. I do not remember the part number though

 

Gotcha. Yeah, I've driven plenty of Minis and was always blown away at the performance difference on the GP2 brakes. I love everything about my 06' R53 JCW except the brakes. Even though they have the factory JCW upgraded calipers, I'm wanting some more braking performance. Many people have done the swap to the R56 JCW brakes, which I like, but I want to be crazy and put the GP2 brakes on my R53 if possible. Good to know that some GP2 parts may be backwards compatible, jumping from 2 pots to 6 pots will mean the whole system needs a good upgrade. I think I have ended up in uncharted territory here as most people seem to think the R56 JCW 4 pots are an adequate upgrade. Excited to figure out this process and share the results.

 

 

Yes! This is awesome! I've got questions for you because I haven't found any threads on this install.

Do these calipers bolt right on?
Are you using GP2 rotors or something else?
Have you upgraded any components like reservoir or master cylinder? If so, what did you use for that? I'm wanting to stick as OEM as possible and want to know how many GP2 components are backwards compatible.
Have you tried any stock wheels on here for fitment? Any spacers needed for spoke clearance? I like the 17's I have for my R53 right now because good tires tend to be about 1/2 the price of 18s in my area. Curious if I can still get away with those or if I need to get some R56 17s like R112 or GP2 wheels, or if I need to find R95 and use those.

From my understanding this is actually a pretty straightforward setup as you only need different brake lines and a different e brake cable to actually get them on the car and working? Is that right or am I totally naiive?

Thanks for anything you can share. Excited that I'm not alone in this idea.

 

Kind of old thread but I'll add some information here. I got the 6 pot brakes for my r52s this summer. Definitely the pedal feels soft, brakes work but they have a lot of travel if it makes sense. I bought the GP2 master cylinder, but it does not have the port for the DSC and it would not fit. When I feel like it (It might take a while since the car is not my daily and I only drive it in the summer) I will look into trying to make the GP2 master cylinder work.