The Wilwood combination hydro-mechanical parking brake caliper for 2003–2008 Audi A4 rear applications replaces the stock unit with a caliper that uses hydraulic pressure for stopping plus an internal mechanical lock for parking. CPB kits are intended for front-wheel-drive and select rear axles unsuited to internal shoe brakes and include oversized two-piece rotors with aluminum hats and high-friction BP-10 compound pads for balanced braking performance.
Wilwood 03-08 Audi A4 Caliper-Combination Parking Brake Rear 12.19 Rotor - Black