944T Rear Brembos on an 84NA hub/disk
 

I think I read somewhere that you shouldn't use a 944T 94mm bolt spaced rear caliper with the earlier NA disk and hub, but I can't find it.

Do you need to run 944T disks on the early NA hubs to make use of the 944T caliper? Everything bolts up fine as is.

Any pointers much appreciated.

Thanks

Steve
Sydney, Australia

The disk width's do not match. The 944T rear caliper works with a 24mm wide disk, while the 944NA front rotor is 20.4mm wide. Your best bet is to use a Boxster front rotor (24mm) with the 944T rear caliper.

Lanner

Boxter front Rotors?
 

Lanner,

You wouldn't happen to know if this will mess around with the offset will it? Any idea what the part number is of the boxter caliper, or which model / year I should be asking for?

Thanks a lot

Steve

86 only 944t rotors. 24mm

The hubs have to match the rotor. So, with the early hubs you can only do the early NA rotors. The 86T front rotor (28mm)will bolt to the early NA hubs, but because of the offset difference on the hubs, the rotor will be way too far inboard and will foul on the steering arm of the spindle.

Why not just keep it all the same (ie Turbo front rotor with turbo front caliper and matching hub)?

The other option is late 944 hub (87+) with boxster (1st gen) rotor and 944/993 rear T caliper in the front.

Lanner

I should have specified this is for the rear of the car, not the front.

The fronts are all 944T with Lanners kit. Its just the rears that use the 944NA hub, and I want to use the 944T rear calipers to have the same look 4 pot calipers all round.

Cheers

Steve

That clears thing up. In retrospec, I should read the titles first....sorry.

Use a 86 (only) T rear rotor, 86+T rear caliper. Everything bolts up, and typically need a small spacer (about 3mm) to center the caliper on the rotor. The later (87+) rear T rotors have a different center bore, so they technically fit but then the centering of the rotor is only done by the setscrews; not the ideal situation. The 86T rear rotor is the only one with the correct center size for the early NA hub.

Lanner

A little late in the conversation, but you can use the boxster s rear rotor, and then you don't have to worry about the 3mm spacer.

Lanner

r
 

the boxter 's'/996 rear rotor is 299mm by 24mm -70mm high
-so its the same as the 85 turbo?

-how does it differ

?
http://www.speedways.co.uk/apec/list/porsche/5.htm

-plus its drilled?
use an adaptor and run the radial mount 996 calipers

OH i seeeeeeeee

http://www.speedways.co.uk/apec/list/porsche/11.htm

-the 996 disc although 299 and 24mm, is 75mm overall height!!!

hmmm -does it still work ok?

-got adaptrs for 996 rear calipers/???
-no i am worried they wont work
:confused:

i'm confusing myself now
-the 85 disc is 298 by 28mm -70mm high
:) -so the thinner-24mm disc

--must just get 1

944T rear - 299x24
Boster rear - 292x20
Bosxter 's' rear - 299x24

With the 944T rear rotor on a 944NA rear setup, you need a 3mm spacer and longer caliper bolts. With the Boxster S rotor, you don't need the spacers. Both rotors will work with the 944T rear caliper and the 944NA brake shoes and hardware.

Lanner

According to this:

http://www.speedways.co.uk/apec/list/porsche/13.htm

there are two different "overall heights" on the rear discs for the Boxster S (68 mm and 75 mm). Which type is the correct one?

--
Gorm

The Boxster S rotor that I mocked up and works with the early NA backing plate is pn:986.352.403. The brakes shoes end up 'just' flush with the 'drum' surface (laterally speaking). No spacers are required to centralize the caliper.

The 86T rotor is 951.352.041. You will need 3mm shims and longer bolts to centralize the caliper.

As a shameless plug:D , I now offer hardened washers and longer grade 10.9 bolts for the job. About $C18.

Lanner

Thanks Lanner,

I will go for the Boxster S rotors...

Gorm

One other thing, with the Boxster S rotors, the disk-to-hub retaining screws don't line up. Also, last time I checked the Boxster S rotor was about double the cost of a 86T.


Lanner

Lanner,

Can you tell us if we should be getting the Boxster S disk with a 67mm height or a 70mm height?

Thanks

Steve

I'll try and dig them out this weekend and measure....

Any luck finding out which height is should be Lanner?

Thanks

Steve

Yup, it's the 67mm ones (2000-2004 Boxster S)

Hey
Guys
I am currently running Boxter S rear discs 964 2 pots in the rear
Am also using Lanners spacers

Oh this is on a 64 swing axle bug.
Needs slightly more than the 3mm though. But works great
Using 944 MC outlets are reversed. Rears are fed off the front port and fronts off the rear port.

Dean;)

I have easily and successfully added 944T/928S4 calipers to 944/924S N/A arms with 944/924S discs(rotors). The disc thickness is less than ideal but periodic monitoring will ensure that the pads don't wear down too far to pop the pistons. I anticipate fitting 299x24x71 944T/928S4 discs when the pads wear down that should comfortably correct the disc thickness issue. I also expect some shimming to still be required to centre the disc.

The rear ports (closest to the pedal i.e.23mm dia) should feed the front brakes regardless. The front ports i.e. the 19mm dia feeds the rear brakes.