Porsche Brembo 996 BBK conversion

[D-O]

Hello Everyone,

I just purchased my e46 m3. The car came with this exact conversion. Can you all help me with the following questions? Thanks

1. Can anyone recommend some more aggressive pads for front and rear? Can you send me the direct link or part number? I feel the stock Porsche pads are kind of soft and don't stop really hard with aggressive driving.

2. I see conflicting answers to this question. Is this BBK conversion from a 996 Turbo and a Cayman S? I see some websites saying they sell the pads for with the part numbers but they say (except for Turbo models, or Except for Cayman S). If I was to go to a shop to rebuild the calipers, what car do I say these calipers and set they are from?

3. Are both the front and rear 4 pot?

Thanks for all your help

Welcome to the forum.

Right from the Rally Road site (most conversions are done using their kit):

Front:

Calipers used for this conversion are Front Calipers from the 1999-2004 Porsche 996 (non-turbo), the Boxster S or the Cayman S. All these calipers are made from the same Brembo casting.

The Porsche caliper part numbers for this conversion are:
996.351.425 (driver side)
996.351.426 (passenger side)

Rear:

Calipers used for this conversion are Rear Calipers from the 1999-2004 Porsche 996 (non-turbo), the Boxster S or the Cayman S. All these calipers are made from the same Brembo casting.

The Porsche caliper part numbers for this conversion are:

996.352.421 (driver side)

996.352.422 (passenger side)


Both front and rear are 4 pot.

I will leave the brake pad recommendations to others.

[ca86108]

Hello Everyone,

I just purchased my e46 m3. The car came with this exact conversion. Can you all help me with the following questions? Thanks

1. Can anyone recommend some more aggressive pads for front and rear? Can you send me the direct link or part number? I feel the stock Porsche pads are kind of soft and don't stop really hard with aggressive driving.

2. I see conflicting answers to this question. Is this BBK conversion from a 996 Turbo and a Cayman S? I see some websites saying they sell the pads for with the part numbers but they say (except for Turbo models, or Except for Cayman S). If I was to go to a shop to rebuild the calipers, what car do I say these calipers and set they are from?

3. Are both the front and rear 4 pot?

Thanks for all your help

[Slideways]

Would coding for CSL bias be different than ZCP?

Pretty sure they are the same as they both got the same braking hardware.

[D-O]

Do people code their MK60 ABS to the CSL bias with this setup? Being more rearward, like the CSL, I'd think so, but not seeing anything definitive.

Would coding for CSL bias be different than ZCP?

[Arith2]

I noticed something weird with not using the using the backing plates with the adhesive. After about 15k miles, the front rotors wore unevenly. The inner and outer and outer edge of the rotors wore ar minimum spec while the middle of the rotor was only about .6mm low. Minimum spec is when they wear 1.6mm. The rotor surface was rounded and the inner and outer edges were actually pretty even in measurement while the thickest point was in the middle. I used proper pads because when I went to my Porsche parts for new pads, they were exactly the same. I think I may be a one off in this but this is a heads up to check to see if this is happening to you.

[Nate047]

Costs are definitely higher now for everything. No question.

As far as MK20 is concerned, that won’t matter unless you’re tracking the car. And even then it won’t be a massive issue if you don’t have aero and slicks. If it becomes a problem, you can retrofit the MK60 and at that point, look into other more serious BBK options.

[Lee_Enfield]

I may have a line on a set of these, whats a good price ebay seems to have them over 1K CAD? Just wondering where people are sourcing there rebuild kits? It seems since the original posts were made in 2020 lots has changed. looked at several of the mentioned sites and either nothing listed or not available. I would prefer original Brembo if possible.

Also, any issues running these with a MK20 ABS car? I have an early 2002.

[mrgizmo04]

For anyone using front Porsche calipers with stock rear, what pads are you using? Just for street use right now, track pads seem a little easier to find info on.

For street use prob doesn't really matter that much, Akebono, Textars, etc.

Just so you are aware with that front/rear setup, you are running underpowered fronts with stock rear, shifting your bias to around 62-63%. As long as you are aware/prepared for at threshold track experiences. Can definitely work around it by running much higher mu front pad, keeping as much weight in the rear as possible (muffler/battery/seats), tighter front compression/rear rebound, negative rake, blah blah, but anyway, all of that has other associated handling repercussions.

Sent from my SM-S911U1 using Tapatalk

[Ubaderb]

For anyone using front Porsche calipers with stock rear, what pads are you using? Just for street use right now, track pads seem a little easier to find info on.

[heinzboehmer]

Do people code their MK60 ABS to the CSL bias with this setup? Being more rearward, like the CSL, I'd think so, but not seeing anything definitive.

Yeah, most do

[Pklauser]

Do people code their MK60 ABS to the CSL bias with this setup? Being more rearward, like the CSL, I'd think so, but not seeing anything definitive.

[nyc951]

Any thoughts on 996 BBK clearance with E39-spec'd BBS RG-Rs? I have a set of 996 calipers being prepped but was looking to plan ahead in terms of fitment with the current wheel setup.

• 18x8.5 ET22 Front
• 18x10 ET25 Rear

The general consensus seems to be that it won't clear, and I believe Repoman has already test fitted them and found that it won't clear,

But I was also able to find someone who did get them to work with E46-spec RG-Rs (18x8.5 ET38 Fronts) with a 12mm spacer up front (guessing based on the owner's previous posts):

A 12 mm spacer would effectively make the front specs 18x8.5 ET26.


Thread about the wheels shown above: 18" BBS R-GR's w/Porsche 996 BBK Fitment - NA M3 Forums

I can’t answer your question. However I have an e39 M5 and have been looking for the RG-Rs, and I live in MA. Let me know if you ever sell those wheels. Serious (I’m a mature adult, just have a car parts problem).

[Obioban]

If anyone has been able to source Brembo GT kit grade seals, I need some!

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/229329-porsche-brembo-996-bbk-conversion-let-s-figure-out-how-to-fix-the-dust-boots-seals

[Arith2]

I believe the bleeder screws are around 8nm. I've used a torque wrench on a bleeder and I've only seen one guy use one. I also caught him torquing underbody screw to 2.8nm. Just snug but not too tight. A solid 10-15nm will do

[Nate047]

Thank you kindly!