Front brakes Rear brakes MOV' IT six FAQ Better brakes for Audi RS4 Two new kits for the Audi RS4 makes a perfect car even better! 370 x 35 rotors with 4 piston monobloc calipers or 6 piston "billet" calipers. Both the 370 x 35 4m6 and 380 x 32 4m6 fits under stock 18" wheels. RS 4 (08.00 - ) Front  342x34 6m3  370x35 4m6  370x35 6s1  380x32 4m6  380x32 6m2  Rear  322x28 4s1