Discussion in 'Engine maintenance, upgrades and modifications' started by Loony, Apr 17, 2019 at 11:47 AM.
Are there some simple inexpensive options you can recommned?
Z4M/CSL Rear Calipers have larger pistons than the stock M3 items, which may help things on the rear
OK, but after some diameter and maybe a 4 pot caliper....
The only one ive seen is the AP Kit
Remember in a 4 pot, 2 of the pistons are reactive to the opposing pistons.
This is why in Effective Piston Area calculations, single piston sliding calipers are assumed to be a "2 piston" caliper. After all, it's Newton's Third Law. Of course, it's not quite that simple.
From memory, stock M3 calipers are 43mm, and the CSLs are 47mm.
Are the pads different? Or do i have to change the calipers and the carrier?
Hi they are the same shape as I have csl rear calipers with normal m3 performance friction pads .I believe genuine csl pads are a different compound to normal m3 thoughI don't think I changed the rear carriers though ,was a while ago though!!
Depends how upgraded you want them? Track or road driving. Personally I would get them refurbed, braided lines and good pads.
ap 5144 callipers utilising the standard disc for £850 ish would get my vote
There's not many upgrades that increase disc size at the rear. I've E92 M3 discs all round and using R35 GTR calipers at the front and 911 GT3 at the back.
The most straightforward upgrade for the rear is either;
996 Boxter S calipers with 996 front pads, brackets and lines from the likes of Rallyroad on standard E46 discs
AP calipers as mentioned with standard discs.
Or just upgrade the orginal brakes with braided lines, upgraded bushes or CSL calipers.
To be honest, the rear bbk is just for cosmetics 9 times out of 10