Ensure your truck is Ready for the Road Ahead™ with the ideal amount of tension in the brake linkage, with the OTR 1.5" Cam / 10-Spline / 5.5"/ 6.5" Manual Slack Adjuster. To reduce the amount of wear in the air brakes, this replacement checks the amount of slack between the brake shoe and the brake drum, and automatically adjust the distance as needed. Built with a compensating mechanism that alters the position of the pushrod as the brakes wear down. FleetPride is your First Click in Heavy Duty®.