Porsche Brembo 996 BBK conversion

[D-O]

Has anyone tried ECS 2-piece rear rotors with Rally Road adapters on the 996 conversion? I'm wondering if the fit is similar to stock rotors, or if the ECS rotors are too thick for this setup.

I did not use them, but I did seriously consider them. When I called ECS to price the replacement friction rings they informed me that they no longer sell them separately, but will give you a discount on replacement rotor assemblies when the time comes. I do not recall what the discount was, but from a purely price perspective they did not make sense vs. the OEM crosssdrilled rotors. HTH anyone considering them with the idea that replacements will be comparatively cheap.

D-O

oops - just noticed you were inquiring about the rear rotors - I was only referring to the fronts!

[Arith2]

Has anyone tried ECS 2-piece rear rotors with Rally Road adapters on the 996 conversion? I'm wondering if the fit is similar to stock rotors, or if the ECS rotors are too thick for this setup.

They shouldn't be any different but BMW CSL rotors are also 2-piece rotors. I was looking at them after they arrived and even though they're bigger than old rotors, the weight is much less according to my internal weight meter. They're also $150 cheaper than the ECS ones. It's really cool how BMW made their 2 piece look like a 1 piece for the surface. It's very discrete. The wheel covers the hub so I guess it doesn't matter that much.

[Actuary]

They shouldn't be any different but BMW CSL rotors are also 2-piece rotors. I was looking at them after they arrived and even though they're bigger than old rotors, the weight is much less according to my internal weight meter. They're also $150 cheaper than the ECS ones. It's really cool how BMW made their 2 piece look like a 1 piece for the surface. It's very discrete. The wheel covers the hub so I guess it doesn't matter that much.

Thanks for the info!! I have the front ECS rotors and would like to have a matching rear on my 996 setup. In addition, the ECS front rotors are holding up much better for me on the track. I"m likely to stick with the OEM CSL rotors in the back, especially given the cost. But it would be good to know if the rear ECS rotors can clear the 996 brakes.

[HighOnLSB]

Like many others I used this DIY to rebuild my calipers and the install DIY from xpme46m3 to do this project. One of the biggest projects I've tackled on my own to date, made a couple mistakes but learnt a lot along the way and am extremely pleased with the outcome! Just waiting on decals now.... 🙄

[Jimmy_L]

damn looks good. i want to rebuild one but hard to come by a decent condition and priced set of calipers

[Tbonem3]

Good stuff Titaniu//M & HighOnLSB !

[maupineda]

I have completed the painting. I decided to not paint the hardware for a more OE look. they came out good, not perfect. but more than enough as they get dirty most of the time. I should be able to install them later today or tomorrow.

Thanks for this amazing guide!

[S14]

Looks great man!

[maupineda]

I have completed my install.

All went in like butter as I had cut the shields in advance.



Now with the wheel



And for the fronts I went a different direction, but still looks nice and works nice!

[WOLFN8TR]

Looks Good!

[Zekarus]

I changed one o-ring on the rear today. Looks like I punctured it during install and it was leaking through the dust boot. I also had a spongy end point. It's now way harder to push the break. So far the best mod on my car.

[maupineda]

Now a photo under the sun, brakes do improve the looks of a car.

Before



After



And from the other sunnier / shiner side (sun)

[Arith2]

These transformations bring joy to my soul

[duracellttu]

Great info guys! I was just asking this question in another thread. I’m running OEM ZCPs and currently have 12mm spacers in the front. Picked up a set of 15mm spacers based on old info, but looks like I won’t need them. I’ll report back after my install.

They'll fit, but will the gap be questionable? Please report back thx!

Post pics! I want to see that I haven't been insane this whole time ranting about 12mm or smaller spacers on this setup lol

awesome, please keep us updated.

I know there have been a few updates since this was first discussed back in April, but I am at the tail end of my install and wanted to follow up on the discussion of OEM ZCP wheel (factory staggered setup) and spacer sizes.

Wheel Setup: My car is a factory US ZCP model which has 19x8.0" ET47 in the front and 19x9.5" ET27 in the rear.

Brackets:I am also using the Rallyroad adapter brackets for both front and rear calipers. Earlier discussion mentioned issues with having to grind down the front brackets to get them to fit on the king pins and/or grinding down the brake pad dowel pins to prevent binding on the rotor. I didn't have any of these issues. My brackets fit perfect and the caliper was centered on the rotor without to the use of any washers on the adapter bracket.

Spacers: There was some old M3forum information that 15mm spacers with OEM ZCP staggered setup was the recommended setup. Based on that I had purchased 15mm spacers. After test fitting everything a 15mm spacer will clear the caliper. However, it was WAY too close for comfort. There was <1mm clearance between the caliper and the wheel. The closest points of clearance were at the top and bottom front edges of the caliper to the inner wheel spokes. I understand that everybody will have a different opinion on how much clearance is "required". My recommendation is to get a 17.5mm or larger spacer. Using a 17.5mm spacer will give you ~3mm of total clearance. Pictures are below showing the clearance between the caliper and wheel.

I'm not sure how mainstreamer00 had an entire finger between his caliper and wheel. My guess is that he was running OEM ZCP rear sized wheels in the fronts and didnt know it?? I have 12mm spacers in the garage but didn't even try fitting them after seeing the clearance with 15mm spacers.

[Tbonem3]

Thanks for confirming! So it's the csl wheel that can get away with a 12mm or maybe even 10mm as the csl version of the wheel sticks out 9mm more than zcp version. 18-9=9. Though that doesn't account for any difference in the spoke clearance between csl and zcp, if there is any. (I think csl version has slightly more concavity).

I'm mounting csl wheels now, but I'm going to use a 12mm spacer, so I'm sure clearance will be fine. I can post pics.

And you're only the second person besides me I've seen note that they didn't nice to mod the front brackets or king pin to fit.