Spicer Automatic Slack Adjusters are available to fit 12-1/4, 15, 16-1/2 and 18 inch brakes, without interference with suspensions or other axle components.

Spicer auto slacks adjust at the end of the release stroke when there is no braking and no force on the adjusting mechanism, assuring proper adjustment at all times – not just after a hard stop.

A fixed control arm eliminates wear parts like rods, boots, pins, and ball joints that shorten the life of other slack adjusters.

Additional Features

• Clearance sensing mechanism assures proper lining and drum clearance for maximum stopping power.
• Integral installation indicator, standard on most auto slacks, assures proper installation with a quick visual check.
• Reduces risk of in-service manual adjustment errors, minimizing roadside inspection violations.
• Insures uniform wheel-to-wheel brake adjustment, contributing to proper brake balance.
• Integrated mechanism sealed for complete contamination protection. No external boots or seals to wear.
• Universal application for complete interchangeability with manual slacks. No left-or right-hand models needed unless an offset is required.
• Double Bend design available with all trailer axle applications for easier installation.
• Backs off just like a manual slack adjuster at reline.
• Best warranty in the business; 6 years/750,000 miles for on highway line haul applications, 2 years/100,000 miles or two relines for school bus and city delivery applications.