Product Details: Outfit your truck to be Ready for the Road Ahead™ with the ideal amount of tension in the brake linkage, with the Meritor 1.5" Cam / 28-Spline / 5.5" Automatic Slack Adjuster. This replacement component checks the amount of slack between the brake shoe and the brake drum, and automatically adjusts the distance as needed to reduce overall wear. Manufactured with a compensating mechanism that modifies the position of the pushrod as the brakes wear down.