last fall i upgraded to the wilwood front brake kit for na cars and today one of the local vw tuners emailed me and gave me what sounds like a fair price for 951 rear calipers with almost new race pads.

has anyone tried this?

would it mess the balance up?

is there a distribution valve to fix the balance if its wrong?

 

Hi there thirdgen, I have an 84 N/A with Wilwoods on the front and baby Brembos on the rear. The Brembos combined with the Wilwoods give you stupid stopping power but you should set up a turbo brake bias valve if you are going to track the car to keep the braking balanced. I believe its listed as a brake pressure regulator. One of the pro setup guys at Pelican has the info you need cause he's done a few of them. Are you running turbo rotors in the rear?

 

Hey thirdgen, don't you have a 924s? Would a turbo caliper swap be a simple bolt on? Front and rear?

 

Rears are a direct swap, fronts are not as they require a different spindle+hub+strut housing setup.

 

In the rear you will need the 944 turbo rotors as well as the spacer shims (washers) to do it right as the 944 NA rotors are smaller than the turbo. the late ones anyway, didnt see a year mentioned.

 

Does anyone know where I could find sizing info for 944 and 951 rear brakes? I see that Clark's has the rotor thickness, but I'm more interested in rotor diameter and piston sizes.

Thanks

 

yeah, its a 924s. like idolea stated, the rears are a bolt on and thats all i cae about. i already have the wilwood fronts.

thanks for the info. ive currently got the stock rotors. what are you running for rear rotors?

where do the shims go? behind the rotor? is this still a direct swap?

if you find this info, let me know!

 

do i need new brake lines too?

 

Either way it'd be cool to get all new SS lines

 

i already have all new stainless steel lines. i dont want to have to buy a set of four just to get two back ones....

it looks like turbo and na cards use the same lines

 

Yup, they do.

 

these are 1987 calipers going on a 1987 924s (early offset)

it sounds like 86 951 rotors are a direct fit with no shims. can you confirm this?

 

paragon has the info for 951 calipers, but not 944/924...

 

i am new to brake modifications so correct me if i am wrong, but the stock 951 front calipers are 40 and 36mm and the rears are 30 and 28. with a wilwood/brembo setup, i will be 41mm front and 30/28 rear.

this would give a stock turbo 4549mm^2 of piston area per side and wilwoods 5280mm^2 of surface area.

this mean a wilwood/brembo setup (with the turbo bias valve) would have MORE (16% using a stock 951 bias valve) front braking than a turbo. something 951 owners complain about already.

this would lead me to believe that the common 33/5 bias valve with a wilwood/brembo setup would give me a braking bias somewhere between a stock 951 and a 951 with a 33/5 valve...

the only downfall would be 16mm smaller front rotors that are 7.5mm thinner. this would mean that they would heat up faster, but also cool don faster (maybe not an issue with a na?)

I know this is all overkill for a 924s, but i got a deal i couldnt refuse on the rear calipers (bailed out a friend that needed cash) and i will be ready if the day ever comes to do my motor swap. (i am also learning and having fun)