Prepare your semi to be Ready for the Road Ahead , with the OTR 381mm x 88.9mm Brake Rotor that offers 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. Built with precision standards to remove defects and provide long-term durability. OTR understands what it takes to repair and maintain Class 6-8 trucks, so they deliver solutions, making your job easier and more efficient. OTR warranties are comparable to or better than OE and top brands. All heavy duty truck parts offer the same form, function, and fit as the OE replacement parts. FleetPride is your First Click in Heavy Duty .