ZenRXSeven

Yeah, a master cylinder from a 929, or so I've heard. I read that on the internet once.



The piston in a 929 master cylinder is longer/wider, I'm not too sure which, but it moves more fluid than a stock FC one.



Also: I want a big brake kit for rear too! 'Cause big brakes are bling-bling, lol.

j9fd3s

well the 929 is pretty good, but its still not quite right. we tried a dual master setup and that didnt work either. we do have the plans for 4 piston rear brakes, but you loose the ebrake

ZenRXSeven

Holy crap, 4 piston rears is pretty insane, lol. But, umm... how would you park the car without the ebrake??

Seppuku

I would guess you'd use a line lock, keep it in gear, or just dont park at all.

Apex13B

carbon/carbon...I WIN!

djgiantrobot

the bore on the 929 MC is 1in, FD and S5 are 15/16", S4 is 7/18". This applies to the turbo model FCs, but anyway has anyone found a reason to go with 6pistons and 4 in the rear?

I would think that you'd be able to lock them up pretty much at will even on race tires with a bigger 4 piston i the front and a proportioning valve, or at least thats been my experience in the past.

I've noticed that alot of the racing FCs use upgraded fronts (bigger rotors and bigger 4 pistson calipers) and larger rotors in the rear on stock calipers. What is reason for going even bigger?

Apex13B

the bigger the rotor, the more swept area. The more swept area you have, the cooler the pads and rotors run.

djgiantrobot

yeah obviously, but, that isn't waht i was asking. If you'll humor me for a second, increasing the caliper size or the number of pistons in the caliper also has to do with heat disipation but also with clamping force.



If you can already lock up the brakes with race tires on a 4 piston and have no heating problems why go to a 6?

My question is: at what point does an upgraded 4 piston caliper become not enough and the need for a 6 piston caliper arise? Under what racing conditions i guess is what i want to know.



This is important to me because i am almost finished what i thought would be a marketable big brake kit using a larger 4 piston caliper in the front and stock in the rear with larger rotors.