975876N is a Bendix automatic slack adjuster for air brakes. It takes up the slack that builds as brake lining and drum wear, so the brake chamber stroke stays inside the allowed limit without hand adjustment. A wheel end that measures beyond the allowed stroke is out of adjustment, which is the main sign an adjuster is not keeping up. The adjuster is not always the cause, though: the chamber, clevis, return spring, camshaft bushing, drum or lining can also be at fault, so look over the whole wheel end. This is a genuine Bendix part from Pro Gear and Transmission. Call us to confirm proper fit for your application.A factory handling fee of $20.00 per unit is added at checkout.FeaturesBendix automatic slack adjuster, air brake typeTakes up slack as lining and drum wearKeeps brake chamber stroke inside the allowed limitOverstroke at a wheel end is the main sign of a problem; check the whole wheel endGenuine Bendix part sold by Pro Gear and Transmission