Product Details: Outfit your semi to be Ready for the Road Ahead™ with safe and reliable stopping power, with the Meritor 9-13/16" x 4-9/16" Twin Piston Caliper Air Disc Brake Pad Kit. Thanks to its specialized design, this replacement disc brake pad set is able to work alongside the rotor to create friction that rapidly brings vehicles to a stop. Crafted with durable and heat-resistant components to reduce how often the pads need to be changed. FleetPride is your First Click in Heavy Duty®.