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138.2810

5.5IN GUNITE SLACK ADJUSTER

This is an automatic slack adjuster for heavy-duty truck and trailer air brake S-cam systems. It connects the brake chamber pushrod to the S-camshaft, automatically maintaining proper brake shoe-to-drum clearance to ensure consistent braking performance. This unit follows the Gunite style design, featuring a 1.5-inch diameter bore with 28 splines and a 5.5-inch arm length (center-to-center). Replace this component when the internal adjustment mechanism wears or fails, causing excessive brake slack that can lead to reduced braking power and uneven wear.