Front Dual Piston Wilwood Black Calipers 120-10937 -BK (Wilwood D-52 Brake Pad). Rear GM Powder coated E-Brake calipers large bore single piston (not Wilwood). Forged billet aluminum bodies, stainless steel pistons, and competition style high-temperature seals put and end to the rust, bore pitting, and seal failures that plague the OE caliper design.