Prepare your truck to be Ready for the Road Ahead™, with the Meritor 1.5" Cam / 28-Spline / 5.5" Automatic Slack Adjuster that offers the ideal amount of tension in the brake linkage. Thanks to its tension-based design, this replacement component is able to check the amount of slack between the brake shoe and the brake drum, and automatically adjust the distance as needed to reduce overall wear. Fashioned with a compensating mechanism that modifies the position of the pushrod as the brakes wear down.