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135i Brembos (Same as Mini GP2s) upgrade thread.  Dump info in here! >

Drivetrain 135i Brembos (Same as Mini GP2s) upgrade thread. Dump info in here!

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Drivetrain 135i Brembos (Same as Mini GP2s) upgrade thread. Dump info in here!

Old 07-31-2018, 11:38 AM
favino1006 is offline
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Join Date: Mar 2012
Location: Rockledge, FL
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Hi Guys,

I've got a GP2 with oem calipers. When my last set of stock front pads went, I noticed the bottom of the pads were much more worn than the top. Mini Orlando told me the lower pistons were sticking and they ended up replacing the calipers completely, under factory warranty. This was back in Jan. Fast forward a few months, I just finished a weekend at Sebring last weekend and I noticed a slight metal on metal sound from the front passenger side. When I got home and pulled the wheels, I found the pads were worn down to backing plate on the underside portion. Meanwhile, the top portion probably had a good quarter inch of material or so so intact. The brake wear sensor was nowhere near touching. All the dust boots of course are destroyed. Have any of you had this uneven pad wear issue? I read in the thread about the smaller piston being the lead... Could the calipers being installed incorrectly, upside down cause this much uneven wear? It seems unlikely that two sets of calipers would have been installed incorrectly... I'll also mention, I've just been running oem pads for both street and track use. The car came to me with a maintenance package that included all pad, rotor and fluid replacement through 2020. No matter how fast I go through them, Mini has been taking care of it at no cost to me. regardless, once I've sorted this issue with the pistons, I'm going to start running some track specific pads and some Motul 600. This is just nuts.

Also, the links earlier in the thread for replacement aluminum pistons are no longer working. Has anyone found a really good source for replacement stainless steel pistons that you've been happy with? Links? I've found these so far:


Also, the Mfg part # for Stoptech E82 135i SS piston upgrade is: ST-135-UPGRADE
ECS has them here: https://www.ecstuning.com/b-stoptech...t-135-upgrade/
Turner has them as well: https://www.turnermotorsport.com/p-3...-135i/?pdk=AQI

Has anyone run either of these upgrades?

Last edited by favino1006; 07-31-2018 at 04:09 PM. Reason: more info added
Old 10-06-2018, 03:52 PM
Mereco is offline
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Join Date: Nov 2015
Posts: 107
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Got the brackets cut 3mm with 15 wheel spacers on S-lites (S-heavies)and they fit ! After I rebuild the calipers I will let you guys know how the pedal feels
Old 02-10-2019, 07:04 AM
blue al's Avatar
blue al
blue al is offline
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Join Date: Aug 2007
Location: oxford england
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I'm looking to go down the same path soon with my roadster

so started digging for more information https://www.bremboparts.com/europe/e...gp/000057564-1

Useful info if looking at 2part discs

Also listing of bmw pad numbers

Last edited by blue al; 02-11-2019 at 04:38 AM.
Old 02-24-2019, 05:00 PM
Andy_W is offline
Join Date: Feb 2019
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Hi. Brand new forum member here but not new to car forums. Have a lot of time at the bimmerpost forums (you can check my rep on the link below). Reason I am posting is I have a complete set of 135i brembos for sale which already have the Racing Brakes SS piston upgrade. Only reason I am selling is that I upgraded to Stoptechs. Thread here: https://www.e90post.com/forums/showthread.php?t=1567318

Anyway, I hope my posting here is not viewed negatively but I stumbled across it googling what cars can be upgraded with the 135i brembos and figured someone here might be interested. Thx.


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