Image is for illustration purposes only. Actual part may vary.

ACF6404-1

SLACK ADJ 37 SPL 6

This is a manual slack adjuster for heavy-duty air brake systems. It connects the brake chamber pushrod to the camshaft, converting linear motion into the rotational force needed to spread the brake shoes. Designed with a straight arm, a 37-spline hub for a 1.6-inch diameter camshaft, and a 6-inch arm span, it is manually adjusted to keep brake shoe-to-drum clearance within spec. Often used on Fruehauf trailers with Propar axles, this part directly cross-references to Haldex KN44041 and many other OEM/aftermarket numbers.