Update your semi with rapid application and release of its air brakes, with the Hendrickson SURELOK 3-Way Pilot Brake Valve that ensures you're Ready for the Road Ahead. This replacement valve controls the flow of air in and out of air brakes, ensuring that a proper amount is reached to efficiently actuate the braking mechanism. Designed with a robust body to endure harsh operating conditions and a variety of climates. FleetPride is your First Click in Heavy Duty.