Cbozz rear BBK retrofit for F85/F86

Cbozz · 10-08-2021, 04:55 PM

I’ve been wanting to get that ugly rear caliper off the car for a while now so finally time has come!!!
I almost pulled the trigger on the Tronik's rear bbk retrofit but I was not a fan of the shape of their caliper... I ended up finding a Brembo GT caliper and retrofitted that onto the rear...
I had a custom bracket manufactured and also custom brake pad was manufactured to fit the rear GT4 caliper and also to cover the whole area of the rear rotor... I'm pretty sure Tronik's pad leaves a bit larger rust ring on the rotor... so the brake pad I designed with help of the manufacturer in California (Porterfield Brakes - made out of R4-S compound) is almost twice the size of the OEM and it covers the whole rotor like OEM without any additional rust ring and also looks like the front OEM pad- the portion that is sticking out the caliper..
The pad I designed also has the brake wear sensor slot and it's a low dust ceramic pad made out of their most aggressive sport compound...
swap is a simple and straightforward thing..
breaks work great, maintain the OEM feel since the rear 4 piston ratio to OEM size is about 101%...
I ended up spending over 3 months developing all this and seems like went through a bunch of pad designs and different brackets....
all in all this whole kit including pads without stainless steel lines ran me about $1300 so compared to $1600 plus pads from Tronik I think it was a no brainer...
If someone is interested in this PM me. I can get these for you... I'm definitely all for getting rid of those ugly rear floaters!

Enjoy!

SaNGRia · 10-08-2021, 05:41 PM

I am the first customer of Chris. And this is the BBK exactly what i wanted. The Porsche BBK is just wasn't for me since the design is way out of my league. This is the same BBK i have on my E93 M3 on the rear end. And now having this is just completes the BBK on my F85 and looks identical to Ceramic BBK kit rear caliper!

I went with the OEM color option and the color is i think even better than the OEM one

Chris spent tremendous amount to make this project possible for our cars. The Pad design to Adapter is just perfect. Even better that he went ahead and calculated a pad that covers the entire surface of the rear rotor so there is no rust ring anymore. Plus the pad design is identical to front portion. This is just the best OEM+ mode ever!

I was in a long vacation and just came back. I will be installing them soon

Here is the pics of my Rear BBK :

Thank you Chris for your hardwork! I highly recommend this to anyone!

KLR X5M · 10-08-2021, 05:46 PM

So 1300 with Everything in matching blue colour to the fronts?

Cbozz · 10-08-2021, 05:48 PM

Quote:

Originally Posted by KLR X5M

So 1300 with Everything in matching blue colour to the fronts?

Yup, right around there

Blue By You · 10-08-2021, 07:39 PM

Cool, seems like a great mod!

Klienfeld303 · 10-09-2021, 07:12 AM

Quote:

Originally Posted by Cbozz

Ok, so I have been wanting to get that ugly rear caliper off the car for a while now so finally time has come!!!
I almost pulled the trigger on the Tronik's rear bbk retrofit but I was not a fan of the shape of their caliper... I ended up finding a Brembo GT caliper and retrofitted that onto the rear...
I had a custom bracket manufactured and also custom brake pad was manufactured to fit the rear GT4 caliper and also to cover the whole area of the rear rotor... I'm pretty sure Tronik's pad leaves a bit larger rust ring on the rotor... so the brake pad I designed with help of the manufacturer in California is almost twice the size of the OEM and it covers the whole rotor like OEM without any additional rust ring and also looks like the front OEM pad- the portion that is sticking out the caliper..
The pad I designed also has the brake wear sensor slot and it's a low dust ceramic pad made out of their most aggressive sport compound...
swap is a simple and straightforward thing..
breaks work great, maintain the OEM feel since the rear 4 piston ratio to OEM size is about 101%...
I ended up spending over 3 months developing all this and seems like went through a bunch of pad designs and different brackets....
all in all this whole kit including pads without stainless steel lines ran me about $1300 so compared to $1600 plus pads from Tronik I think it was a no brainer...
If someone is interested in this let me know... I'm definitely all for getting rid of those ugly rear floaters!

Enjoy!

Look great man! I wish bmw would just make this truck with sick brakes. 🤦🏻*♂️

Yuille36 · 10-09-2021, 08:26 AM

Quote:

Originally Posted by Klienfeld303

Quote:

Originally Posted by Cbozz

Ok, so I have been wanting to get that ugly rear caliper off the car for a while now so finally time has come!!!
I almost pulled the trigger on the Tronik's rear bbk retrofit but I was not a fan of the shape of their caliper... I ended up finding a Brembo GT caliper and retrofitted that onto the rear...
I had a custom bracket manufactured and also custom brake pad was manufactured to fit the rear GT4 caliper and also to cover the whole area of the rear rotor... I'm pretty sure Tronik's pad leaves a bit larger rust ring on the rotor... so the brake pad I designed with help of the manufacturer in California is almost twice the size of the OEM and it covers the whole rotor like OEM without any additional rust ring and also looks like the front OEM pad- the portion that is sticking out the caliper..
The pad I designed also has the brake wear sensor slot and it's a low dust ceramic pad made out of their most aggressive sport compound...
swap is a simple and straightforward thing..
breaks work great, maintain the OEM feel since the rear 4 piston ratio to OEM size is about 101%...
I ended up spending over 3 months developing all this and seems like went through a bunch of pad designs and different brackets....
all in all this whole kit including pads without stainless steel lines ran me about $1300 so compared to $1600 plus pads from Tronik I think it was a no brainer...
If someone is interested in this let me know... I'm definitely all for getting rid of those ugly rear floaters!

Enjoy!

Look great man! I wish bmw would just make this truck with sick brakes. 🤦🏻*♂️

As one that has the Tronik Rear BBK, this Brembo GT4 kit looks good. Yes, it's thru that the Porsche Panamera brake pad doesn't cover the entire rotor surface, and does leave a ring. I eliminated that rust ring by painting it, with liquid silver spray paint. And since then the rear rotors still look good. But I have to admit having a pad that covers the entire rotor would be nice.

I would also argue the that Tronik rear caliper is torsionally stiffer as it has a bridge between the left and right banks eliminating any flex.

But overall, that is a nice setup, a lot of thought and effort went into it. I wish someone had done this research before I purchased the Tronik kit, could have saved me $300. 😢

m3fuz · 10-09-2021, 09:26 AM

I would absolutely do this in the factory color for $1,300.

SaNGRia · 10-09-2021, 03:43 PM

There is 2 reason i went with Brembo GT BBK Kit. 1- Design 2- I got pissed off Tronik by making astronomic number of a BBK adapter for the Porsche Panamera Caliper. It is a Joke. I did offer him to lower the price that he listed on the other brackets which was about $300ish , but No he did not. All my money goes to Chris no issue there!

Blue By You · 10-09-2021, 05:32 PM

I recommend painting your rotor hats as part of this mod (and when you get new rotors) because they get ratty after a while. I recommend painting them black if you have black wheels and silver if you have regular wheels.

Cbozz · 10-09-2021, 06:22 PM

Quote:

Originally Posted by m3fuz

I would absolutely do this in the factory color for $1,300.

I can make that happen, hit me up

LOW4LYF · 10-10-2021, 12:56 AM

@OP

Can you please explain what is included in your kit? Not sure if I understand...

Thank you

StatenEye · 10-10-2021, 08:58 AM

Quote:

Originally Posted by Cbozz

I can make that happen, hit me up

I will be as well next week. I'm going to do new rotors, should i jut pick those up from BMW?

Yuille36 · 10-10-2021, 10:57 AM

Quote:

Originally Posted by StatenEye

Quote:

Originally Posted by Cbozz

I can make that happen, hit me up

I will be as well next week. I'm going to do new rotors, should i jut pick those up from BMW?

I would order them from Pelican Parts, as they are much cheaper than the dealer. I believe, I paid $350 for the front and $315 for the rears a few years back.

ekological · 10-10-2021, 02:21 PM

One of the cheapest parts place online is Husker BMW (a.k.a bmwdirectparts), but they charge shipping (no tax to NJ and probably the same to NY). They have them for $323 fronts $255 rears. I'm not sure if Pelican charges for shipping, but their prices are the same as FCP Euro and FCP does not charge shipping for on orders over $50 and has the lifetime replacement option. They have them for $385/$304 f/r. One last trick is to create an account on FCP, add them to your cart and then leave it. You will get an email that they are still holding your cart and then get another email the next day with a 5% coupon, which comes close to negating the 6.625% tax in NJ...sucks to be in NY in this case.

Quote:

Originally Posted by StatenEye

I will be as well next week. I'm going to do new rotors, should i jut pick those up from BMW?

Cbozz · 10-10-2021, 04:23 PM

Quote:

Originally Posted by StatenEye

I will be as well next week. I'm going to do new rotors, should i jut pick those up from BMW?

Pm me for more details

Mazing81 · 10-10-2021, 05:12 PM

Nice choice of caliper color

Teej-h · 10-10-2021, 06:21 PM

I am interested in getting this setup from you. PM sent.

blown99 · 10-10-2021, 08:01 PM

I am so down for this! Question tho, what happens when it's time to replace pads? Will they only be available through your designer?

Cbozz · 10-10-2021, 08:57 PM

Quote:

Originally Posted by LOW4LYF

@OP

Can you please explain what is included in your kit? Not sure if I understand...

Thank you

It’s a caliper, bracket, caliper to bracket bolts, and brake pads you can order online from Porterfield brakes, I’ll give you the part number for my custom pad I designed with them…

Cbozz · 10-10-2021, 08:59 PM

Quote:

Originally Posted by blown99

I am so down for this! Question tho, what happens when it's time to replace pads? Will they only be available through your designer?

You can buy them online, Porterfield brakes have my design on file so they will make it… I think they require 5 day lead time or something like that but it’s not long…

cfm56d7b · 10-10-2021, 09:20 PM

One of the best mods recently. Great results!

10-08-2021, 04:55 PM	#1
Cbozz Colonel 689 Rep 2,716 Posts Drives: M3 Join Date: Feb 2012 Location: South Florida/ St. Louis iTrader: (27) Garage List 2016 BMW X5M [0.00] 08 BMW M3 [0.00] 14 BMW X5 50i - sold [0.00] 09 BMW 335i - Sold [0.00] 09 BMW 328i - Sold [0.00] 07 BMW 328i - Sold [0.00]	Cbozz rear BBK retrofit for F85/F86 I’ve been wanting to get that ugly rear caliper off the car for a while now so finally time has come!!! I almost pulled the trigger on the Tronik's rear bbk retrofit but I was not a fan of the shape of their caliper... I ended up finding a Brembo GT caliper and retrofitted that onto the rear... I had a custom bracket manufactured and also custom brake pad was manufactured to fit the rear GT4 caliper and also to cover the whole area of the rear rotor... I'm pretty sure Tronik's pad leaves a bit larger rust ring on the rotor... so the brake pad I designed with help of the manufacturer in California (Porterfield Brakes - made out of R4-S compound) is almost twice the size of the OEM and it covers the whole rotor like OEM without any additional rust ring and also looks like the front OEM pad- the portion that is sticking out the caliper.. The pad I designed also has the brake wear sensor slot and it's a low dust ceramic pad made out of their most aggressive sport compound... swap is a simple and straightforward thing.. breaks work great, maintain the OEM feel since the rear 4 piston ratio to OEM size is about 101%... I ended up spending over 3 months developing all this and seems like went through a bunch of pad designs and different brackets.... all in all this whole kit including pads without stainless steel lines ran me about $1300 so compared to $1600 plus pads from Tronik I think it was a no brainer... If someone is interested in this PM me. I can get these for you... I'm definitely all for getting rid of those ugly rear floaters! Enjoy! Attached Images __________________ Evolve, Eisenmann, Strasse, StopTech, Active Autowerke Last edited by Cbozz; 12-26-2021 at 10:37 PM..
	Appreciate 8 Blue By You631.00 Klienfeld303287.00 4everkidd645.50 SaNGRia986.00 cfm56d7b5886.00 Seattlesquash894.50 MikeM6148.00 Surgx572.50 Tweet Quote

10-08-2021, 05:41 PM	#2
SaNGRia Major 986 Rep 1,349 Posts Drives: LCI E93 M3 + F85 X5M Join Date: Dec 2013 Location: Florida iTrader: (0)	I am the first customer of Chris. And this is the BBK exactly what i wanted. The Porsche BBK is just wasn't for me since the design is way out of my league. This is the same BBK i have on my E93 M3 on the rear end. And now having this is just completes the BBK on my F85 and looks identical to Ceramic BBK kit rear caliper! I went with the OEM color option and the color is i think even better than the OEM one Chris spent tremendous amount to make this project possible for our cars. The Pad design to Adapter is just perfect. Even better that he went ahead and calculated a pad that covers the entire surface of the rear rotor so there is no rust ring anymore. Plus the pad design is identical to front portion. This is just the best OEM+ mode ever! I was in a long vacation and just came back. I will be installing them soon Here is the pics of my Rear BBK : Thank you Chris for your hardwork! I highly recommend this to anyone! __________________ E93 M3 6MT , Nav, Prem, Cold Weather, Sports package, & CA, RGBW DTM with RGB Demons + Eisenmann Race + BE + ARP + Brembo GT 380s, $3AG, $5AC, $508, $6NF, $601 Please "Appreciate" If you like my post! DIYs : OEM Camera Retrofit, FLA Retrofit , Drive Shaft Ticking , Starting Issue, , F85 ACC Retrofit
	Appreciate 3 Cbozz688.50 sly1types431.50 Seattlesquash894.50 Quote

10-08-2021, 05:46 PM	#3
KLR X5M First Lieutenant 223 Rep 304 Posts Drives: F85 X5M Join Date: Apr 2020 Location: ON iTrader: (0)	So 1300 with Everything in matching blue colour to the fronts?
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10-08-2021, 07:39 PM	#5
Blue By You Major 631 Rep 1,233 Posts Drives: 2017 LBB X5M F85 Join Date: Jan 2021 Location: MA iTrader: (0)	Cool, seems like a great mod!
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10-09-2021, 09:26 AM	#8
m3fuz First Lieutenant 199 Rep 363 Posts Drives: 17 X5M, 19 X3 30i, 03 C4S Join Date: Nov 2020 Location: MetroWest, MA iTrader: (0)	I would absolutely do this in the factory color for $1,300. __________________ 2017 X5 ///M 2019 X3 XDrive 30i 2003 Porsche C4S
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		BMW X5 and X6 Forum (F15/F16) > BMW X5 (F15) and BMW X6 (F16) Forum > BMW X5M (F85) and X6M (F86) Forum
Cbozz rear BBK retrofit for F85/F86

10-09-2021, 03:43 PM	#9
SaNGRia Major 986 Rep 1,349 Posts Drives: LCI E93 M3 + F85 X5M Join Date: Dec 2013 Location: Florida iTrader: (0)	There is 2 reason i went with Brembo GT BBK Kit. 1- Design 2- I got pissed off Tronik by making astronomic number of a BBK adapter for the Porsche Panamera Caliper. It is a Joke. I did offer him to lower the price that he listed on the other brackets which was about $300ish , but No he did not. All my money goes to Chris no issue there! __________________ E93 M3 6MT , Nav, Prem, Cold Weather, Sports package, & CA, RGBW DTM with RGB Demons + Eisenmann Race + BE + ARP + Brembo GT 380s, $3AG, $5AC, $508, $6NF, $601 Please "Appreciate" If you like my post! DIYs : OEM Camera Retrofit, FLA Retrofit , Drive Shaft Ticking , Starting Issue, , F85 ACC Retrofit
	Appreciate 0 Quote

10-09-2021, 05:32 PM	#10
Blue By You Major 631 Rep 1,233 Posts Drives: 2017 LBB X5M F85 Join Date: Jan 2021 Location: MA iTrader: (0)	I recommend painting your rotor hats as part of this mod (and when you get new rotors) because they get ratty after a while. I recommend painting them black if you have black wheels and silver if you have regular wheels.
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10-10-2021, 12:56 AM	#12
LOW4LYF Brigadier General 2163 Rep 4,106 Posts Drives: E92 M3 & F85 X5M Join Date: Jul 2016 Location: @Home iTrader: (1)	@OP Can you please explain what is included in your kit? Not sure if I understand... Thank you
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10-10-2021, 05:12 PM	#17
Mazing81 New Member 6 Rep 26 Posts Drives: F10 535 G20 330 Join Date: Oct 2021 Location: Windy City iTrader: (0)	Nice choice of caliper color
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10-10-2021, 06:21 PM	#18
Teej-h New Member 0 Rep 11 Posts Drives: 2016 X5 50i M sport Join Date: Sep 2021 Location: MT iTrader: (0)	I am interested in getting this setup from you. PM sent.
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10-10-2021, 08:01 PM	#19
blown99 Second Lieutenant 196 Rep 293 Posts Drives: 18 X6M Join Date: Dec 2019 Location: Colorado iTrader: (0)	I am so down for this! Question tho, what happens when it's time to replace pads? Will they only be available through your designer?
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10-10-2021, 09:20 PM	#22
cfm56d7b Lieutenant General 5886 Rep 10,256 Posts Drives: 2017 440i Gran Coupe & 2015 X5 Join Date: Nov 2012 Location: Orange County, CA iTrader: (2)	One of the best mods recently. Great results!
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