I think I'll go with 15mm to be safe, does anyone know if the above link will be OK and if the price is good? He's local so I can go and collect.

What spacers would I need to space the rear out to match the front?

possibly 20mm on the rear?

why not wait until you get hold of the 15mm spacers and try them on the rear... then you'll know if there right or if another 5mm would look better

go on edition, guy selling porsche brembo's with brand new 312's, comes with pads, lines etc, also has 256mm vented rears with callipers and new discs for 600, bargain!!!

http://www.edition38.com/forums/index.php?showtopic=351008

Edited 25 December, 201015 yr by Waky

go on edition, guy selling porsche brembo's with brand new 312's, comes with pads, lines etc, also has 256mm vented rears with callipers and new discs for 600, bargain!!!

http://www.edition38.com/forums/index.php?showtopic=351008

do not buy them the 996 rears are terrible calipers.... the piston size is just too small to be used on the front of a car... hence why there rear calipers!!

they will fool you into thinking the brakes are amazing, slow speed etc with the 4 pot initial bite... but when you really need them thats all you get the initial bite then nothing as the pistons are too small!!!

avoid

do not buy them the 996 rears are terrible calipers.... the piston size is just too small to be used on the front of a car... hence why there rear calipers!!

they will fool you into thinking the brakes are amazing, slow speed etc with the 4 pot initial bite... but when you really need them thats all you get the initial bite then nothing as the pistons are too small!!!

avoid

surely the 4 pistons of these callipers will be a far greater than the single piston of a normal single piston vrs calliper, therefore much greater stopping power.... might not be as good as the front brembos but better than vrs power...

surely the 4 pistons of these callipers will be a far greater than the single piston of a normal single piston vrs calliper, therefore much greater stopping power.... might not be as good as the front brembos but better than vrs power...

nah there was like a 20 page thread about it on uk mk iv's

lots of people were dissapointed... and someone worked out the surface area of the pistons and the oem 288's had a bigger stopping power... yes they will feel like 4 pots but the braking overall will be worse than standard

found it taken from uk mk iv's

The braking feel of the 996 rears is very misleading.

they give you a very good initial bite, but when you press the pedal harder to stop faster then they have nothing left to give.

This problem will be masked even further if you have a higher spec disc and pad combination, as obviously that will give a better performance on its own.

Again, the basic problem is that the 996 rear pistons are too small. When you do the maths you find that the area of the pistons is actually smaller than the original caliper. Have a look at the Stoptech website for an explanation of braking.

I think people are being sucked in to this by the fact that the caliper has 4 pistons so must be better than the oe caliper.

However, as you'll find on the Stoptech website, when comparing the oe caliper and the 4 piston one you only calculate the area of 1 side of the 4 piston caliper.

From the ecstuning website the oe front caliper has a piston area of 2205 and the Boxster front caliper, which is the one ecs use in their kit, and Neuspeed to, is 2274, so bigger than oe, and thats why that caliper works.

But the 996/Boxster S rear caliper has significantly smaller pistons, so has less area and so less available braking force. IIRC the Boxster front caliper has 36 and 40mm pistons and the 996 rear has 28 and 30mm. So it is obvious that the 996 rear is the wrong caliper.

I'm not just saying this all from a bystanders point of view ie more internet ramblings. I'm one of the people has been through this exercise.

When I had the 996 rears on my car it was exactly as described, nice firm pedal, very little pedal travel, excellent initial bite but then nothing more when pressed further. On one occasion when testing these brakes after fitting, the rear brakes were almost on fire after a few hard stops from only 50-60mph. There was just so much more braking effort at the rear than the front. And that wasn't with any performance discs or pads.

I then went out and bought a brand new pair of Boxster front calipers. The difference was incredible. A little more pedal travel yes, but the harder you pressed the pedal then the faster you stopped, no matter how many times you tried it. Just exactly as it should be. It of course would have been even better had I got a set of performance pads and discs.

Thats my experience with the 996 rears, if you choose to heed the advice or not is up to you, if you choose to use the 996 rears, or not, is up to you.

All I can finally say is do some more reading to understand what it is you are doing, but not on forums, look at the experts websites, and do some maths before you decide.