Product Details: Equip your semi to be Ready for the Road Ahead™, with the Meritor 1.61" U-Type Air Disc Brake Rotor, a crucial element to offer smooth front and rear brake performance. After the brake pedal is pressed, this replacement rotor works with the brake pads and caliper to create a compression mechanism that slows the vehicle. Constructed with precision standards to remove defects and provide long-term reliability. FleetPride is your First Click in Heavy Duty®.