Outfit your semi to be Ready for the Road Ahead™ with the fresh new brake pads, with the Meritor 8-1/2" Twin Piston Caliper Type Air Disc Brake Pad Kit. Thanks to its twin piston caliper design, this replacement kit is able to efficiently distribute brake force to bring vehicles to a smooth, comfortable stop. Crafted with top-quality brake pads to efficiently distribute heat and extend the service life of the air brakes.