Our complete rear drum brake upgrade kit replaces the rear drum brakes on mid-sized
GM cars with the larger and more powerful versions found on full sized GM cars. The
11” drum brake kit is a direct bolt on replacement for the 9 ½” rear brakes, which
came on GM 10 bolt or 12 bolt vehicles. There is no special valving or master
cylinder needed to install this kit. You will notice a significant seat of the pants
difference, once this kit is installed and it retains an original factory look.