Rear BBK, do I really need it ?

[Clubber]

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]

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]

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]

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]

Not in my experience.

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

[Clubber]

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

That seems to be the default choice I understand.

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_]

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]

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

[trackm3_csl]

[QUOTE=CraigMillwardCroft;n526647]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]

[QUOTE=trackm3;n526648]

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.

[trackm3_csl]

[QUOTE=CraigMillwardCroft;n526649]

I think they were pagids ? and are all blistered.

Have you any pictures ? Looking down on the pads fitted ?

[shimmy]

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.

After 8 years I think money spent on the AP kit was the best money I ever spent on the CSL......if I was to recommend to anyone buying a CSL to track it would be the first thing on any list to buy

[billyboysm3]

Great balance when braking hard.

[need4speed]

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

Are you driving with DSC on again!! :hahaha:

[alexk]

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.

This is probably because when installing the rear 4 piston calipers, the brake bias moves more to the rear of the car.