I know I'm going to be waxed for asking this but.....

[Alistair C]

with the rear 996's, it's not about how much fluid is required to move, but it's about pad surface area

I'm sure someone will correct me if I'm wrong, but the size of the internal cavities is critical when doing brake swaps.
Using a stock system, when you push on the brakes, a certain amount of fluid will be sent to the front and rear calipers, the ratio being determined by the bias valve.

If you change your front calipers for ones with much smaller internal cavities, in effect thsi will make the calipers bite much too early and way before the rears even come into play.

I'm sure those calipers would give all the braking force required, but I'd just be wary of the whole brake bias issue.

As I say - could be wrong - or blowing this whole issue out of proportion.
I do know of people with corrados (which use single pot calipers) - changing over to 4 pot Brembos without any issue.

Can anyone throw any experience or physics on the subject ??

[NoNonsense]

Well, you are probably correct, but I know someone who has Boxster front calipers on his 90 and his car brakes just as well as mine with the 996 calipers. For what it's worth, the 996 rear is a smiggin' bigger than the boxster fronts.

[Alistair C]

Well, you are probably correct, but I know someone who has Boxster front calipers on his 90 and his car brakes just as well as mine with the 996 calipers. For what it's worth, the 996 rear is a smiggin' bigger than the boxster fronts.

Castings might be a bit bigger on the 996 calipers, but according to the Porsche parts catalogue I've got here,

996 fronts have 36 & 40 mm pistons
996 rears have 28 & 30 mm pistons

986 (std boxster) fronts have 36 & 40 mm pistons
986 rears have 28 & 30 mm pistons

Same piston sizes - just designed for different disk diameters and thicknesses.
Would explain why your mate with his 986 front calipers is having no problems..... ?

[NoNonsense]

any ideas on pad surface areas??

[Alistair C]

any ideas on pad surface areas??

http://www.ebcbrakesdirect.com/image...ds/DP21207.jpg
boxster front

http://www.ebcbrakesdirect.com/image...ds/DP21208.jpg
boxster rear

http://www.ebcbrakesdirect.com/image...ds/DP21278.jpg
996 front

http://www.ebcbrakesdirect.com/image...ds/DP21208.jpg
996 rear

[kwlw]

2Panzerwagen - what is further progress of the idea to put porsche 996 rear calipers to the front of the coupe ?

I'm asking because, I've got proposal to get 996 GT3 rear calipers for nice price.

Sau

[90quattrocoupe]

2Panzerwagen - what is further progress of the idea to put porsche 996 rear calipers to the front of the coupe ?

I'm asking because, I've got proposal to get 996 GT3 rear calipers for nice price.

Sau

If not mistaken, GT3 rears are the same calipers as the 996 fronts.

Greg

[Alistair C]

With regard greg's comment above - it was also my understanding that GT3 rear calipers are the same as Carrera / Boxster S fronts.

However, according to my Porsche parts catalogue (2000), the GT3 rear caliper has small pistons (28 & 30mm) - just like rears on the Carrera / Boxster S cars.

It is however possible that more recent GT3s share Carrera / Boxster S fronts.

Sorry if this doesn't clear anything up!

[kwlw]

If not mistaken, GT3 rears are the same calipers as the 996 fronts.
Greg

I think that you can be mistaken. It's hard to believe, that car uses same calipers in front and in the rear.

From the forum I can see, that according to the part number these are "simple" 996 rear calipers :/. Of course it could be that "gt3" just had a badge on the back and was a wrecked boxter . I'm not familiar with porsche models and this 996 doesn't mean something to me .

But google says, that 996 352 426 and 996 352 425 calipers are rear calipers from some porsche turbo.

Sau