Brakes

[Cocacolakidd]

Hello all,

Is there any place one can find a list of the caliper size, and rotor size on the different 944's, and 968's? I am starting into upgrading the brakes on my 85.5 944na. This list would be a starting point to figure what knuckles/spindles, hubs, rotors, and calipers to search for, for the upgrade. I have started with a pair of Calipers I purchased from a friend. He is telling me that the calipers are off of a 944 turbo s. They look much to small to be from that car. They are 4 piston calipers, but they will only allow a 1" thick rotor to fit. I have always assumed that the rotors from a turbo S were 304mm X 32mm ? What are they - or is there a list to figure this out.

Thanks for all, Ed.

[Techno Duck]

Pictures of the calipers? The Turbo S used larger calipers in the front and the same calipers as the regular 944 Turbo in the rear. It depends what calipers you got.

Your '85.5 will require early offset rotors from an '86 944 Turbo. Also you will need '86 turbo Spindles and hubs (not sure about the hubs, you may be able to reuse your old ones).

The rear calipers bolt right up, but you need the correct rotors.

There are a few other mundane things like different length bolts.. but you can worry about that after you figure out what you need.



Caliper on the left is a regular 944 Turbo caliper, they look the same front and rear, though the piston sizes are different. On the right is a Turbo S front caliper.

Based on your description, i bet he sold you the rear calipers.

[Cocacolakidd]

10-4, they look just like the left picture of the Rear Turbo Calipers.

Thanks for the information, and the photos - that helped allot. I am still looking for a list of the brake sizes (rotors, and caliper sizes and discriptions) for 944's, and 968's, if such a list exists.

Again thanks, Ed.

[Techno Duck]

I dont think there is a definitive list out there. But the 944, 944S and the 924S all used the single piston calipers front and rear.

The 944 Turbo, S2 and 968 all used the same 4-piston Brembo calipers front and rear.. the only difference being larger pistons in the front than in the rear.

The M030 968 and the 944 Turbo S used a larger caliper in the front, but the same rear caliper as the 944 Turbo.

Im not 100% sure what the M030 944S2 used, but i am pretty sure it was the regular 944 Turbo front caliper.

[Cocacolakidd]

Hi all,

Thanks for all of the great information. I think with this information I can go full speed with a good brake upgrade. As I understand it I will use 944 turbo S front knuckles, hubs, calipers, and rotors. For the rear the 944 turbo calipers should mount to my existing set up with the addition of the larger rotors.

Thanks, Ed.

[Techno Duck]

In order to fit the Turbo S calipers on your '85.5.. you will need to utilize the '86 Turbo spindles and get the adapter blocks to mount of the bigger Turbo S caliper.

A Turbo S spindle is not only very expensive, but will not fit your car right due to the offset differences.

Also speaking from some experience, i think the bigger Turbo S caliper is overkill for the 8v n/a cars. I have the regular turbo 4-pistons on my car and its more than adequete stopping power. The Turbo S calipers would only really benefit you if you do some very heavy track use and are in upper run groups.

It takes some getting used to the Turbo calipers on a non-ABS car like mine.. i had to relearn braking pressure because i was locking them up excessivley.. the Turbo S calipers will be even worse unless you run some very wide rubber on the front or have ABS (which your '85.5 probably dosent).

I was able to fade the single pistons by the last few runs at auto-x, that was properly bled, good pads and good fluid. Ive yet to be able to fade the turbo calipers.

Also remember, to run any of the 4-pistons, you need to run a minimum of a 16-inch wheel.

[Cocacolakidd]

Hello all,

Thanks John, I appreciate all of the wonderful information. Doing the brakes is the first of many mods I plan for this little 85.5. There is suspension mods in the planning - I have Weltmeister Track springs on the ready, along with 30mm front, and 19mm rear sway bars, and Billstein Struts/shocks. They will all go in this weekend. As soon as I get all of the brake parts the brakes will be next. A roll cage in the plans. Next spring I will remove the 2.5Ltr motor in favor of a 3 Ltr (S2 or 968) fully race built with a supercharger. Oh yes and 17" rims all around. I am eyeing the ROH rims for strength and light weight. I will have to experiment with the 245 tread width for front, and 285 tread width for rear, to see how well they will run on different tracks. If these sizes of treads are a bit wide then I will down size to what works best for road race. I think I will have to roll the rear inner fender openings for the 285's to fit. I will keep tuning and experimenting, and hopefully have a quick race car in a couple of years.

Oops I almost forgot about the transaxle, to which I'm looking for a Turbo LSD with cooling lines - Lightened flywheel and clutch assy. in front. All running gear from S2 or 968 heritage.


Also - what are the spacer blocks that are needed to mount the Turbo S front calipers? Calliper brackets?? Would Pelican Parts have these?

I appreciate all of the information, and advice from all.

If you do not have pfunn, do not do it!

[Techno Duck]

They are not spacer brackets, but actual adapter brackets to mount the calipers. The larger Turbo S and M030 968 caliper used a radial mount as opposed to an axial mount. It may be vice versa..but if you see the larger caliper you will know what i mean.

The adapter bracket basically allows you to run the Turbo S style caliper with the regular 944 Turbo spindle.

I am not sure who make this mount but i do know they are made. I cant think of any companies off hand that have it for sure.

Ones to check however are..

Elephant Racing
Kolken (spelling?)
Lindsay Racing

[Intercityfast]

Thanks for super input