Product Details: Update your semi with smooth front and rear brake performance, with the Meritor 1.65" U-Type Air Disc Brake Rotor that ensures you're Ready for the Road Ahead™. Due to its partnership with the brake pads and caliper, this replacement rotor is able to create a compression mechanism that slows a vehicle once the brake pedal is pushed. Engineered with precision standards to remove imperfections and provide long-term durability. FleetPride is your First Click in Heavy Duty®.