New Automatic Slack Adjuster Kit – Heavy-Duty Truck/Trailer Brakes Brand new automatic slack adjuster kit, still sealed in original packaging. Designed for air brake systems on heavy-duty trucks, trailers, and commercial vehicles. This unit helps maintain proper brake adjustment automatically, improving braking performance and reducing maintenance. Includes: • Automatic slack adjuster assembly • Mounting hardware & fittings (as shown) • Installation instructions • Original box
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