This Apec Black Brake Caliper is designed for the Front Right position of vehicles. It features a Grey Cast Iron material, a Vented brake disc type, and is compatible with TRW brake systems requiring a 28 mm brake disc thickness. The caliper itself has a piston diameter of 157 mm. It is specifically compatible with Audi S4 models from 11/2008 to 12/2015 (B8 chassis). Cross-references include A.B.S. 423162C2, Brake ENGINEERING CA3136RP2, and TRW BHX562E. OEM references include AUDI 8K0615124A and 8K0615124G. This caliper is suitable for Audi A4 B8 (8K2) S4 quattro Saloon and Audi A4 B8 Avant (8K5) S4 quattro Estate models with petrol engines, fitted on the Front Axle Right.