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S2 Brake disc confusion

 
Old 12-19-2018, 01:40 PM
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Default S2 Brake disc confusion

Hi everyone.

I'm not new on the forum, but new with my 1990 944 S2 (without M 030 option, with ABS), after selling my 964 Carrera 4 and thereafter my 996 Carrera a (long) while ago.

It's been 2 weeks since I purchased the S2 and when I checked the brakes, I found that the rear discs (rotors) were below the minimal thickness levels. When I look up on PET or online sources, I get 951.352.041.02 code, however what I have on the car are 951.352.041.01 discs, which are supposed to be from the earlier 944 turbo.


951.352.041.02 (100mm depth), what should be...


951.352.041.01 (70 mm depth), what's on the car...

The main difference is the depth of the whole rotor. If I were to order the correct parts with 100mm depth, the discs would go further in and touch the abs sensors.

Since the trailing arms seem to be correct, are there different hubs that would extend further out (by about 30mm) to accept the discs with 100mm depth? How can I return my car's setup to fully original?

Thanks in advance for any help.


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Old 12-19-2018, 03:05 PM
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mj951
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Paragon Products has what you need, I don't own an S2 so not 100% sure of size but they show a rear rotor that fits all S2's.
https://www.paragon-products.com/Por...akes-s/256.htm
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Old 12-19-2018, 04:42 PM
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Thanks for your reply. It is a bit more complex than finding the rotor that will fit.

My continuing search on the internet seems to confirm that my wheel hub has been changed to an older version (1986 turbo) and the rotor is therefore of that car. I don't know why one would do such a stupid swap! I am trying to verify this assumption and, if I so find the correct hub. But I am getting discouraged seeing prices of 1200 USD+ per hub.
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Old 12-19-2018, 07:16 PM
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I was gonna just chime in and joke that the thread title -

' S2 Brake disc confusion'

sounds like it could have been track #4 on a Jimi Hendrix album...

But since you are genuinely stumped, lets set if we can find out what's going on here.

What wheels are on the car...?

Is the front lower control arm aluminum or steel...?

Does the car have factory abs...?

T
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Old 12-20-2018, 01:10 AM
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Well if the previous owner made mods without leaving you records then yeah, little more complicated.
This forum will be able to help. As T mentioned above, let's figure out what you have. Pics are always useful.
This link offers more insight...http://www.944s2.com/

" The rear brakes on the 944 S2 also came from the 944 Turbo. The piston sizes used in these 4-piston Brembo calipers are 28 and 30 mm in diameter. The rear brake pads are exactly the same size as the standard front "930" pads. The rear rotors have a diameter of 299 mm (11.77 in) and a thickness of 24 mm (0.94 in)."
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Old 12-20-2018, 02:38 AM
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A quick check of
https://www.paragon-products.com/Por...352.041.01.htm
at Paragon clearly shows that the ---.01 rotor is from the 1986 944 turbo.

Paragon shows
https://www.paragon-products.com/Por...352.041.02.htm
the ---02 is for '87+ 944 turbos & '89 S2's.

I guessing you have already figured this out though........

Let's see a picture of how the hub is fitted to the axle, ABS was ONLY optional on 87 and later 944 turbos, and standard on 89+ 944's & S2's.
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Old 12-20-2018, 11:23 AM
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Originally Posted by PaulD_944S2 View Post
Paragon shows
https://www.paragon-products.com/Por...352.041.02.htm
the ---02 is for '87+ 944 turbos & '89 (All) S2's.

I guessing you have already figured this out though........
See post #2 for the Cliffs Notes version.
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Old 12-30-2018, 10:31 AM
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Thanks everyone. I didn't have the chance to go on the forum last week, sorry for not responding earlier.

One of the previous owners replied to my emails, and it seems the mystery is solved. The hubs are from 86 Turbo indeed. The guy had a 86 Turbo in parts and when the disc was due for replacement, he wanted to use those discs. However, the discs of the 86 turbo did not fit without changing the hubs too. Luckily the ABS picks up its signal not from the hub, but from the "rear wheel shaft", which goes between the axle and the hub. Therefore, the ABS was not effected. The problem is that he does not have the S2 hubs anymore.

Although there are many second hand hubs on ebay, customs will not allow import of used parts. So I keep searching locally for second hand hubs.
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Old 12-30-2018, 10:35 AM
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Originally Posted by 951and944S View Post
I was gonna just chime in and joke that the thread title -

' S2 Brake disc confusion'

sounds like it could have been track #4 on a Jimi Hendrix album...

But since you are genuinely stumped, lets set if we can find out what's going on here.

What wheels are on the car...?

Is the front lower control arm aluminum or steel...?

Does the car have factory abs...?

T

Well, the car is a genuine 1990 S2 as confirmed by the VIN.
Oh, and all S2's have ABS as standart I believe.
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