Cayenne Front and Rear Brakes on 944

I am working on a rear kit to go with my Z06 fronts.  I ordered myself a Cayenne 4 piston rear caliper, ($50 shipped on ebay).  I believe I have a design that would work with the turbo 300mm rear rotor.  Unfortunately, the caliper didn't come with pads, so I'm not positive on the 7.5mm dimension just yet.  I also don't know if the caliper will have to be offset inward/outward at all yet.  Hopefully I'll know this soon.  My co-worker is printing me a 3D version of the bracket for mock-up.
 

EDIT: Just realized the caliper bolt spacing is 136.1mm on here.  It's supposed to be 136...  Apparently in UG NX 68+68=136.1...  I'll correct that eventually.  
 
I don't know yet if the front calipers have the same 136mm bolt spacing and ~113mm mounting radius as the rears.  If they do, then I believe these same bracket dimensions should work to mount the 17Z 6 piston fronts to 300mm turbo rotors.  The nice thing about this combo is that I believe it might fit with 16" wheels (I don't have any to verify).  The 17Z calipers should also easily mount to the 330mm front rotors, and the 18Z Calipers to 350mm rotors.  

With all this said, this is only for the 944.  The 951 will require a rotated bracket design, and I haven't tried this yet.  On the 944, the 77.5mm and 76mm dimensions in the above drawing are larger on the 951.

EDIT: I have made a grand mistake. For some reason I was under the assumption that the 944 NA front and rear calipers had the same bolt spacing. This was incorrect... The 944 NA rear caliper uses the same mounting as a 944 turbo. Back to the drawing board on the rears. Fronts are great though!

I did some measuring today.  Unfortunately, the backspacing on the caliper isn't right for a simple bracket like this.  To mount the bracket on the inboard side of the caliper, the bracket needs to be spaced back from the 944 hub about 3/4".  To mount the bracket on the outer side of the caliper, the bracket could only be 1/4" thick, which I think is too thin.  The 3/4" spacing seems easier...  This could be a separate piece, welded to the bracket, or if you have a mill, all one piece.  The good news is that you could use this with a 298mm turbo front rotor.  This should allow it to be mounted under stock 951 wheels.

I'll do some CAD and draw a picture tomorrow to better explain. The good news is, I believe most could do this in their garage still with basic tools. I'm still planning to use these on the rear.

Ok, modified the bracket to be simple. This could be done with some accurate drilling no problem. Two pieces of material would be needed. A 6.5"x1.5"x3/8" piece of aluminum and a 3/4"x1"x4" bar of aluminum. Cheap on OnlineMetals.com. I recommend 6061.

https://s224.photobucket.com/user/superman22x/media/944%20to%20Cayenne%20Spacer%20Included%20Iso_zpsm3vvuraa.jpg.html

Ok, made the spacer... After making it, realized it needs to be 1" not 3/4". Anyway, with that, it works. I mocked it up on my fronts with the 282mm discs just to be sure. Looks like it will work great!

Went to the junkyard and picked up a pair of the 18ZR Cayenne Calipers for use with 350mm rotors. Mounted them up today with some scrap I had. I plan to make a proper mount in the next couple weeks. These fit with the 18" wheels no problem. The mounting dimensions are a little different than the rear calipers. I'm not sure if the 17z calipers (for the 330mm rotors) are the same as these or not.

Got my dimensions CAD'd up. Made from 1.5" square bar aluminum. Relatively simple... if you have a mill. I don't have a mill... But my 20" Clausing drill press does pretty well with aluminum milling. Not the greatest surface finish, but it will do the trick.

As an update. I have purchased a mini mill... It is no Bridgeport, but it is a significant upgrade to the shop. I finished my 18Z front mounts and my rear mounts. The mill makes it a much faster procedure to say the least...

Here are the rears:




And the fronts:



I'm sure I could work out a price if anyone really wants me to make these. It's not a real fast process on the manual mill I have (especially with no DRO), but I don't mind making a few.

In addition, if anyone is interested in a set of early hubs that have the OD turned down to fit Cayenne rotors, I have an extra set of early hubs.

Ok, I had a thought and came up with a simpler solution to mounting the Cayenne front calipers. I believe it will be the same for 17z calipers, with 330mm rotors. If someone wants to try this, talk to me first.

My pricing will be $100 for a set of front or rear brackets. If you have an early car, I can machine your hubs for 330mm rotors. If you have a late car, I can provide Cayenne centering rings for $70.

I have made a grand mistake.  For some reason I was under the assumption that the 944 NA front and rear calipers had the same bolt spacing.  This was incorrect...  The 944 NA rear caliper uses the same mounting as a 944 turbo.  Back to the drawing board on the rears.  Fronts are great though!

It's looking like the rears will not work so easily. If I could find a flat head M12-1.50 bolt, I could make it work. Unfortunately, there doesn't seem to be such a thing available. It also seems like Boxster calipers are minimally more expensive, and easy to make work. I believe they are the same exact calipers, just radially mounted. Just like the front cayenne rotors are the same as a GT3 911 caliper I believe.

Out of curiosity, do you have any idea on if these would fit on an early 928's spindles?

I have access to a vw Taureg set of brakes, and was thinking to grab them if it like at all likely to fit.

Unsure on that... If they have the same caliper mounting as an early 944 (76mm between caliper mounts), then yes. If it's wider than that, then they won't fit.

Thanks for the dimensions, I see I'll be taking my metric ruler off to do some measuring.

76mm = 3". If it's different it will likely be obvious.

Looking around for dimensions already documented, I came across the thread you posted on rennlist, and based on that thread about the Corvette calipers, the early spacing is 76mm.

Now I need to verify that the donor vehicle set is actually the 4 piston 330mm setup that should be on an 04...

Nice! I thought I looked into it once but didn't remember. The only one that fit the 944 are the 350mm front 18Z rotor/caliper combo. They only fit with 18" wheels too. I tried the cayenne rears, but they do not fit.

Possibly an issue then...

I was reading one of xschop's threads and he'd initially put 330mm rotors on a car, and then 350mm.
I was thinking to fit a set of the 330mm ones under the 17" wheels from a Boxster that I bought.

Best bet for 330mm rotors is something like 4 piston Boxster calipers or I think some people run 6 piston willwoods. Lexus LS460 calipers are also an option I think?

Hi just wondering if any of these 18Z adapters might still be available?

And if they will work on 1987 944S (NA) front hub/spindles?

Thank you.

Sorry, I am no longer making any brake adapters for the 944. I might still have a few brackets around for C6 Z06 calipers, but that's it.