Prepare your semi to be Ready for the Road Ahead , with the Hendrickson LH 18/24 Air Brake Chamber that efficiently converts the energy from compressed air into mechanical force. To allow for the rapid actuation of the brakes, this replacement component works alongside the brake system to create intense amounts of mechanical force. Fashioned with high-quality materials for a leak-proof and durable design. FleetPride is your First Click in Heavy Duty .