Automatic Brake Slack Adjuster 1.5 Inch Diameter With 5.5 Inch Arm Length For Semi Trucks 28 Spline Teeth Direct OEM Replacement Heavy Duty Truck Part Easy Fit Durable

Automatic Brake Slack Adjuster 1.5 in dia, 5.5 in arm
✔️ Slack diameter 1.5 in, 28 spline teeth, 5.5 in arm, pack of 4

The Automatic Brake Slack Adjuster is a heavy-duty OEM replacement part for air brake systems on semi trucks. It uses a 1.5 inch diameter slack spline with 28 teeth and a 5.5 inch arm length, designed for quick field installation. This 4-pack helps fleets stock common wear parts.

✅ Arm Length: 5.5 in (139.7 mm)
✅ Slack Spline Diameter: 1.5 in (38.1 mm)
✅ Slack Spline Teeth: 28
✅ Replacement For: 40010011
✅ Pack: 4 units

💡 What is a brake slack adjuster used for in heavy trucks and why is it important?

It keeps brake clearance correct, helping braking performance and reducing manual work.

- precise brake clearance - reduces manual adjustments - OEM replacement compatibility - improves wear life✝️