Prepare your semi to be Ready for the Road Ahead , with the Motor Medic Dot 4 Super Heavy Duty Brake Fluid that aids in the transfer of force throughout the hydraulic brake system. By utilizing a specialized formula, this reserve of replacement liquid flushes throughout the brake system to generate hydraulic pressure and lubricate various components. Formulated with a premium mixture to reduce leaks and how often the fluid needs to be changed. FleetPride is your First Click in Heavy Duty .