Equip your semi truck to be Ready for the Road Ahead , with the Meritor 16.50" P / Q Series Dust Shield, a key piece that protects brake components from dirt, debris, and other contaminants. With a straightforward design, this replacement shield helps prevent unwanted contaminants that could cause damage or noise from coming into contact with the brakes. Constructed with an easy-to-install assembly for rapid repairs. FleetPride is your First Click in Heavy Duty .