Product Details: Update your semi with fast and responsive brake pressure, with the Haldex MAXIBRAKE® R-Series Long Stroke Service Brake Chamber that ensures you're Ready for the Road Ahead™. Due to its specialized design, this replacement brake chamber is able to react to pressure from the brake pedal by expanding outward, and allowing the pushrod to activate the brakes. Constructed with rugged materials to provide an extensive service life. FleetPride is your First Click in Heavy Duty®.