The Saab 9.3-II has been delivered with different brake configurations during the years of production, depending on model and engine type. The most sporty Aero and TurboX have big brakes and ventilated rear discs. The less powerful have a lighter set up. Different factory combinations of front and rear brakes were possible. These are not always consistent an may vary per model year and market. A sticker at the left B-pillar tells which brakes are fitted by the factory. All standard brakes are from ATE. Different makes were used for the discs: ATE, Bosch, Brembo. The minimum wheel size is detemined by de diameter of the discs.

Sticker on B-pillar with brake codes. The four last letter combinations show the brakes that are fitted by the factory.

The table shows codes and measurements of the brake parts given by the factory.  A complete overview can been found in the ATE catalogue:
Code
disc
Code
caliper
Diameter
thickness disc mm
Diam. piston caliper mm Diam
rim (min.)
Engines indicative; differences are possible.
Front V = ventilated
AA CA 285V / 25 57 15" 03-07: 1.8i, 2.0t, 1.9TiD;
AB CB 302V / 28 57 16" 2.0T early years
AC CC 314V / 28 60 16"+/17" 2.0T, 2.8V6, Biopower
AD CD 345V / 29,9 60 18" Only TurboX
Rear V = geventileerd S = solid 
BA DA 278S / 12 38 / 40 15" 03-07: 1.8i, 2.0t, 1.9TiD; na 08: 1.8i
BB DB 292V / 20 38 / 40 16" 2.0t, 2.0T, 2.8V6, Biopower; after 08 1.8t,
BC* DB 292V / 20 38 16" Only XWD (*differs from BB)
 
Which brakes are fitted can be identified by looking at the brake calipers. 
The front brake calipers of the 285 mm discs have blade springs similar to the 302 mm brakes up to about '04 and replaced by calipers with wire spring (left picture) later. The 302 mm (middle picture) and 314 mm (right picrture) have blade springs.
 wire 302 mm  314 mm
The rear brakes of both diameters have wire springs and differ only by the diameter and thickness of the solid or ventilated discs.
 

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