rear brembo conversion issue

[baldydaz]

for all of us on here that have done the brembo REAR brake conversion i think i've found an issue.

i fitted my rear calipers a couple of weeks ago with some mintex 1144 track pads.
last friday i did a track day at donington park. after the trackday i checked the brakes etc and found the pads had worn very unevenly. ie the leading edge (bottom) of all 4 pads on the rear were worn almost to the metal while the trailing edge (top) was hardly touched.
if it had been one pad i'd have thought stuck piston/stuck pad etc, but due to it being all 4 worn in the same way........hmmm

now, hopefully a solution.
the calipers on the m3 are mounted at the rear of the wheel. on the porsche they came off they are mounted on the front of the rear wheel.
so the calipers on the m3 are mounted on the wrong side.....
i think the pads have worn this way due to the different size pistons in the calipers.

so, what we need to do is strip the calipers, remove the link pipe from the 'bottom', turn the calipers over, swap sides, swap the bleed nipples from bottom to top then fit the link pipe to the bottom. (we may need to make a new link pipe as the original sits in a recess in the caliper)

this will put the larger piston at the top of the caliper, hopefully curing the wedgy pad problem.......

[alexk]

Originally Posted by baldydaz

the calipers on the m3 are mounted at the rear of the wheel. on the porsche they came off they are mounted on the front of the rear wheel.
so the calipers on the m3 are mounted on the wrong side.....
i think the pads have worn this way due to the different size pistons in the calipers.

That's exactly the case my friend.
The smaller diameter piston needs to be the first 'met' in relation with the disc rotation.

That's also why proper BBK solutions are... much better solutions and not workarounds.

[baldydaz]

Originally Posted by alexk

That's exactly the case my friend.
The smaller diameter piston needs to be the first 'met' in relation with the disc rotation.

That's also why proper BBK solutions are... much better solutions and not workarounds.

true. but someone has to be the first to try new stuff.

[northernjim]

Shame you've ruined a set of pads, but you should just be able to undo the link pipes and bleed nipples and swap them over, the link pipe may be embedded in some silicon which you can just pull out....

[mattCSLnut]

Originally Posted by northernjim

Shame you've ruined a set of pads, but you should just be able to undo the link pipes and bleed nipples and swap them over, the link pipe may be embedded in some silicon which you can just pull out....

Jim, I think the link pipes are threaded, just like the bleeding valves. Well I hope so anyway. Unless I'm not reading what you wrote right

[northernjim]

I meant where the link pipe crosses over the caliper, they usually sit in a groove that some people fill with silicon....

most calipers I have seen have the groove at both ends just so you can swap them for leading or trailing application braking solutions

I'm not too familiar with porsche brembo's tho looking at daz's earlier pics - no groove..

Originally Posted by baldydaz

looking at these pics it should be possible to swap the link pipe, for the bleed nipples and refit the right way round....