Bendix 745-279946N Slack Adjuster is a heavy-duty air-brake component used to automatically maintain proper brake shoe clearance in drum brake systems on commercial vehicles. It is associated with Mack equipment, including Mack 25QD21DP49 and 213690-D configurations, and is identified by part number 745-279946N. By adjusting slack as the brake shoes wear, this unit helps preserve consistent braking response in heavy-duty fleets.
