Rear BBK, do I really need it ?

Clubber · 18-12-2014, 05:11 PM

Hey guys,

Since we are on a winter break for track days, I was planning to do a full AP BBK upgrade. Fronts are given but as I understand rear 4 pistons are a little overkill and most people fit them to have a matching set and for looks. Please correct me If I am wrong.
I am sure they are better than stock setup. No question about that BUT seing new M cars even with ceramics running single piston rears made me think. Some race teams are even stating %75 percent of the stopping power is achieved with fronts and some say even more.

What are your opinions ?

P.S. I am running RS29's, SS Lines and SRF Liquid on stock setup atm.

**alexk** · 18-12-2014, 07:32 PM

I had AP front/rear BBK before I had to sell it.

I bought only front Brembo BBK and the rear is OEM.
All is ok, I didn't see any issue at the track.
The balance feels right (I do trailbraking).

I am not going to upgrade the rear ones.

Clubber · 18-12-2014, 09:42 PM

Quote:

Originally Posted by alexk

I had AP front/rear BBK before I had to sell it.

I bought only front Brembo BBK and the rear is OEM.
All is ok, I didn't see any issue at the track.
The balance feels right (I do trailbraking).

I am not going to upgrade the rear ones.

Thanks for your input Alex,

It is very interesting that most of the vendors I get a quote from are strongly pushing me for the new AP Radi-Cal kit. They say it is superior in every way but I much prefer the classic kit for ease of finding parts and proven performance.

**shimmy** · 18-12-2014, 11:05 PM

Quote:

Originally Posted by Clubber

Thanks for your input Alex,

It is very interesting that most of the vendors I get a quote from are strongly pushing me for the new AP Radi-Cal kit. They say it is superior in every way but I much prefer the classic kit for ease of finding parts and proven performance.

My kits has been fantastic, best by for the CSL by far

0836whimper · 19-12-2014, 12:05 PM

Not in my experience.

AP's up front, OEM at back and decent pads all round is a superb combo.

Clubber · 20-12-2014, 10:10 AM

Quote:

Originally Posted by shimmy

My kits has been fantastic, best by for the CSL by far

That seems to be the default choice I understand.

Quote:

Originally Posted by 0836whimper

Not in my experience.

AP's up front, OEM at back and decent pads all round is a superb combo.

I hope so too although I think I'll put them on each year. This year the fronts and next year the rears, fingers crossed. Unless I win the lotto and go for those new stoptech carbon seramics

_Nathan_ · 20-12-2014, 10:12 AM

I found that the car was more settled under hard braking when I went from just front kit with OEM rears to having the 4 pot rears too, the car seems to dive less, less weight transfer to the front.

**CraigMillwardCroft** · 20-12-2014, 10:56 AM

I am looking at doing the rear kit as uprated pads are just over heating, will get Adem to look into why first.

trackm3 · 20-12-2014, 11:11 AM

[quote=CraigMillwardCroft;177167]I am looking at doing the rear kit as uprated pads are just over heating, will get Adem to look into why first.[/QUOT

What uprated pads are you running ? Have you recorded the temps ?

**CraigMillwardCroft** · 20-12-2014, 11:14 AM

[quote=trackm3;177168]

Quote:

Originally Posted by CraigMillwardCroft

I am looking at doing the rear kit as uprated pads are just over heating, will get Adem to look into why first.[/QUOT

What uprated pads are you running ? Have you recorded the temps ?

I think they were pagids ? and are all blistered.

18-12-2014, 05:11 PM	#1
Clubber S5 - Full Throttle Join Date: May 2010 Location: Istanbul Posts: 359 Casino cash: $6310	Rear BBK, do I really need it ? Hey guys, Since we are on a winter break for track days, I was planning to do a full AP BBK upgrade. Fronts are given but as I understand rear 4 pistons are a little overkill and most people fit them to have a matching set and for looks. Please correct me If I am wrong. I am sure they are better than stock setup. No question about that BUT seing new M cars even with ceramics running single piston rears made me think. Some race teams are even stating %75 percent of the stopping power is achieved with fronts and some say even more. What are your opinions ? P.S. I am running RS29's, SS Lines and SRF Liquid on stock setup atm. __________________ Can, '04 M3 CSL ,'87 M3 Last edited by Clubber; 18-12-2014 at 05:20 PM.

18-12-2014, 07:32 PM	#2
alexk Driving it like I nicked it Join Date: Mar 2009 Posts: 2,786 Casino cash: $29981	I had AP front/rear BBK before I had to sell it. I bought only front Brembo BBK and the rear is OEM. All is ok, I didn't see any issue at the track. The balance feels right (I do trailbraking). I am not going to upgrade the rear ones. __________________ www.clubcsl.com - I am a BMW Motorsport fan ! My youtube channel is here

20-12-2014, 10:12 AM	#7
_Nathan_ Driving it like I nicked it Join Date: Sep 2008 Posts: 2,099 Casino cash: $13060	I found that the car was more settled under hard braking when I went from just front kit with OEM rears to having the 4 pot rears too, the car seems to dive less, less weight transfer to the front. __________________ Nathan

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19-12-2014, 12:05 PM	#5
0836whimper S5, Sport Off, DSC M-track Join Date: Apr 2012 Location: Nottingham Posts: 516 Casino cash: $7379	Not in my experience. AP's up front, OEM at back and decent pads all round is a superb combo.

20-12-2014, 10:56 AM	#8
CraigMillwardCroft CSL Register Uber-poster! Join Date: Oct 2010 Location: Marlow Posts: 3,973 Casino cash: $18153	I am looking at doing the rear kit as uprated pads are just over heating, will get Adem to look into why first.

20-12-2014, 11:11 AM	#9
trackm3 S5 - Full Throttle Join Date: Sep 2009 Posts: 411 Casino cash: $18073	[quote=CraigMillwardCroft;177167]I am looking at doing the rear kit as uprated pads are just over heating, will get Adem to look into why first.[/QUOT What uprated pads are you running ? Have you recorded the temps ?