GP2 Master Cylinder
For SaleBrakes
Apr 3, 2025, 03:28 PM | Replies: 17 | Views: 1425
-
Price
$300• OBO
- Location Rochester, NY, 14623, USA
- Condition New
- Compatibility
| Make | Model | Year |
|---|---|---|
| Mini | Any Model | 2008 - 2013 |
Description:
GP2 master cylinder, new in box. I bought this for my GP2 brake conversion on my R55, but didn’t end up using it. Perfect for your big brake upgrade. Buy mine and save some cash.
https://www.ecstuning.com/b-genuine-...336857907~oem/
I might be interested in this! I'm piecing together the gp2 brakes right now. I have one caliper, once I locate the other side, the rest will be easy. I've read that this master cylinder really helps with the 6 pots. What do you think? I have a JCW and have the 4's on it now.
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Thread Starter
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Alliance Member
Joined: Jul 2016
Posts: 7,514
Likes: 2,483
From: WNY
I might be interested in this! I'm piecing together the gp2 brakes right now. I have one caliper, once I locate the other side, the rest will be easy. I've read that this master cylinder really helps with the 6 pots. What do you think? I have a JCW and have the 4's on it now.
Seriously, I noticed a slight drop in pedal response when I added the GP2 / BMW calipers. That's why I bought this thing. Never got around to installing it, then I sold the car. Now, here it sits... Supposedly, the JCW 4-pots have the same piston area as the S single-pots calipers, so pedal response remains good when you just add the 4-pot brakes. The GP2 6-pots are supposed to have a slightly higher piston area, which will increase the pedal movement required to push enough fluid into the caliper. This effectively decreases the pedal response. Adding this bigger master cylinder will bring the pedal response back to where it should be.
I think you should should go for it
Seriously, I noticed a slight drop in pedal response when I added the GP2 / BMW calipers. That's why I bought this thing. Never got around to installing it, then I sold the car. Now, here it sits... Supposedly, the JCW 4-pots have the same piston area as the S single-pots calipers, so pedal response remains good when you just add the 4-pot brakes. The GP2 6-pots are supposed to have a slightly higher piston area, which will increase the pedal movement required to push enough fluid into the caliper. This effectively decreases the pedal response. Adding this bigger master cylinder will bring the pedal response back to where it should be.
Seriously, I noticed a slight drop in pedal response when I added the GP2 / BMW calipers. That's why I bought this thing. Never got around to installing it, then I sold the car. Now, here it sits... Supposedly, the JCW 4-pots have the same piston area as the S single-pots calipers, so pedal response remains good when you just add the 4-pot brakes. The GP2 6-pots are supposed to have a slightly higher piston area, which will increase the pedal movement required to push enough fluid into the caliper. This effectively decreases the pedal response. Adding this bigger master cylinder will bring the pedal response back to where it should be.
Thread Starter
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Alliance Member
Joined: Jul 2016
Posts: 7,514
Likes: 2,483
From: WNY
Are you going the BMW caliper route, or trying to find OEM GP2 calipers? There are plenty of BMW calipers on Ebay...
BMW route. Found the Driver side a month ago that needed a rebuild, (which I want to do upgraded pistons and paint) for super cheap. Now I'm having a hard time finding a used Passenger side. All I find is new which I'm not wanting to spend the $700 at this time. But, since I got you, and you have done this before, I'll pick your brain lol. I read when doing the BMW, you have to flip the calipers (Driver goes on Passenger and vise-versa), due to the brake hose inlet being upside down. Sounds like the pistons mount correctly in either orientation, but I haven't verified. Do you know if I could just get another Driver side and then have a 90 degree fitting put on for the hose to attach? Thanks!
Neutral
Joined: Jun 2025
Posts: 7
Likes: 2
ECS says this only works for the GP2 brake kit, but does that mean it won't just drop-in replace the S master cylinder - is there something else needed to make it work? Dealer reprogramming? I've got big aftermarket calipers and rotors, so would like to see what the gp2 cylinder would do to help 
Thread Starter
|
Alliance Member
Joined: Jul 2016
Posts: 7,514
Likes: 2,483
From: WNY
ECS says this only works for the GP2 brake kit, but does that mean it won't just drop-in replace the S master cylinder - is there something else needed to make it work? Dealer reprogramming? I've got big aftermarket calipers and rotors, so would like to see what the gp2 cylinder would do to help