Product Details: Update your semi with fast and responsive brake pressure, with the Haldex Type 20 Long Stroke Service Brake Chamber that ensures you're Ready for the Road Ahead™. This replacement brake chamber reacts to pressure from the brake pedal by expanding outward, and allowing the pushrod to activate the brakes. Engineered with durable materials to provide an extensive service life. FleetPride is your First Click in Heavy Duty®.