Product Details: Equip your truck to be Ready for the Road Ahead™, with the Gunite 1.5" Cam / 28-Spline / 5.5" Automatic Slack Adjuster, a crucial device to regulate the ideal amount of tension in the brake linkage. To reduce the amount of wear in the brakes, this replacement checks the amount of slack between the brake shoe and the brake drum, and automatically adjust the distance as needed. Fashioned with a compensating mechanism that modifies the position of the pushrod as the brakes wear down. FleetPride is your First Click in Heavy Duty®.