Front Brake disk fit following models :
928 4,6 S (228 KW) from 09.85-07.86
928 S4 4,9 S (235 KW) from 08.86-07.91
928 4,9 S (212 KW) from 09.85-05.94
928 S4 5,0 KAT (235 KW) from 08.86-07.91
928 5,0 GT (243 KW) from 01.89-07.91
944 2,5 Turbo (184 KW) from 08.89-07.91
Dimensions 304 x 32 mm , Height 77mm, Wear limit 30mm thick
The front disk of the GTS is different:
928 5,4 GTS (257 KW) from 08.91-11.95
Dimensions 322 x 32 mm , Height 77mm, Wear limit 30mm thick
Rear Brake disk fit following models :
928 S4 4,9 S (235 KW) from 08.86-07.91
928 S4 5,0 KAT (235 KW) from 08.86-07.91
928 5,0 GT (243 KW) from 01.89-07.91
928 5,4 GTS (257 KW) from 08.91-11.95
944 2,5 Turbo (162 KW) from 04.85-08.86
Dimensions 299 x 24mm , Height 71mm, Wear limit: 22mm thick
Left and Right Front disc are different due to internal airflow.
| Brand | Front Right | Front Left | Rear | |
| Porsche 928 s | 928 351 044 03 | 928 351 043 03 | ||
| Porsche 928 s4/gt | 928 351 044 60 | 928 351 043 60 | 951 352 041 01 | |
| Porsche 928 GTS | 928 351 046 60 | 928 351 045 60 | 951 352 041 01 | |
| Sebro |
5198 928 351 044 60 |
5199 928 351 043 60 |
5804 (2x) 951 352 041 01 |
 |
| Zimmermann | 460 1514 00 | 460 1513 00 | ||
| ATE | ||||
| Audi | 8A0 615 301 B | 8A0 615 302 B |
Dimensions of the rear brake disk 928 S4-GT-GTS.
Here's a specification document from Sebro:
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So far I have had every disk on apro that my local Porsche dealer had in stock of near the right dimension ( 304mm diam x 32mm thick front and 299mm diam x 24mm rear) with no success as the "offset" or depth were all wrong ( 75mm front from my measurement and I cant find my note on the rear at this time).
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Here are the numbers I found on the boxes I just took my
replacements from, Eddy.
The boxes are Porsche boxes with Porsche labels.
965 351 046 00 and 965 351 045 00 (I think the O45/046
denotes left and right, as the internally cast vanes have a
directional orientation) If you need more precise numbers,
I can look at the old parts and get the numbers off the
castings, later today. Can't tell you whether these are
numbers for front or rear numbers, as I didn't keep track of
the boxes.
I got mine from Devek. 650 592 5287. I think 928
Specialists has them, also.
Don Hanson
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These part # are not for an S4 with standard calipers. The #'s
are for the 322 x 32 rotors from a 94 C2T 3.6. If you want to put
(factory) xdrilled rotors on a S4 you need the 968 M030 rotors, 965 351
041 01 and 965 351 042 01. These are WAY expensive at about $300ea.
BTW, these are the fronts. The rears are 965 352 041 91 and list of $215ea.
HTH.
Michael G. Wachholz
========
You do not need to upgrade to the GTS fronts to get xdrilled rotors.
The ONLY rotors Porsche ever made (had made) that are 304 x 32 (S4, 944 TurboS and 944/968 M030 size) and are xdrilled are the 968 M030 rotors. And they are expensive!!
The Porsche part #'s:
Front
965 351 041 01 (left)
965 351 042 01 (right)
Retail $300/ea.
I sell for $155/ea. Or $300/pr.
Rear
965 352 044 91 (left and right)
Retail $213/ea.
I sell for $190/ea. Or $370/pr.
These will bolt directly on the front and rear of any 928 S4 from 87 -91
Let me know if I can help.
Michael G. Wachholz
Prospeed Motorsports
Ok, in German.... I will translate this some day
Gelochte und innenbelüftete Sportbremsscheiben für den AUDI RS2 und den Porsche 944 Turbo, 928 S4 5,0l und andere. Das Maß ist 304x32x77 mm. Sie können einfach anstelle der Serienscheiben angebaut werden. Es sind keinerlei Anpassungen nötig. Sie haben nicht einfach innenliegende tangentiale Stege wie in Serie, sondern strömungsgünstig gekrümmte Schaufeln, wie ein Turbolader-Rad. Mit diesen Bremsscheiben verringert sich die Ansprechzeit beim Bremsen, insbesondere bei Nässe, Schnee, Dreck o.ä. spürt man einen deutlichen Unterschied. Es bremsen immer alle Räder gleichzeitig an, deshalb kein gefährliches Versetzen oder Ausbrechen beim Bremsen. Durch die Bohrungen erfolgt eine bessere Belüftung und damit Wärmeabfuhr. Diese Bremsen ermüden nicht so schnell, man schont die Beläge (kein Verglasen duch Hitze), der Verschleiß sinkt und sie werden nicht - wie das Serienpendant - in den Bergen oder bei schnellen Autobahn-etappen überlastet.