Product Details: Ensure your semi truck is Ready for the Road Ahead™ with increased brake power, with the Haldex 3030 Standard Stroke Gold Seal Piggyback Brake Chamber Kit. Thanks to its compact design, this replacement chamber is able to stack on top of another, allowing the two to work in tandem to create large amounts of brake power. Crafted with rugged materials to tolerate rough or heavy duty working conditions. FleetPride is your First Click in Heavy Duty®.