How do I remove a manual slack adjuster?

REMOVE SLACK ADJUSTER. Rotate the manual-adjusting bolt counterclockwise (or clockwise with ArvinMeritor products) to back off the slack adjuster so it separates from the clevis. Use an impact wrench, because this task will destroy the internal clutch mechanism found in most automatic slacks.

What are manual slack adjuster?

To compensate for the gradual wear on the brake shoe lining, manual slack adjusters are equipped with an adjusting mechanism, which provides a means of adjusting for brake lining wear. Slack adjuster models are available in various arm configuration, lengths and spline types.

How can you tell the difference between manual and automatic slack adjusters?

Automatic slack adjusters have an adjusting mechanism that adjusts for brake lining wear. However, manual slack adjuster periodically needs to be adjusted to properly function and operate at peak performance and compensate for lining wear.

How much travel should a slack adjuster have?

Automatic slack adjusters are designed to continuously and automatically maintain the brakes in proper adjustment during normal use. However, they must be checked daily to ensure they are maintaining proper push rod travel – less than one in. (25.4 mm) when manually pulled and less than two in.

When should you manually adjust an automatic slack adjuster?

It adjusts and takes up the slack in the stroke as the friction surfaces wear away. In a “normal” U.S. highway environment a manual slack adjuster would probably need adjustment approximately every 10,000 miles.

How much free play should you expect in a slack adjuster?

Use a tool such as a small pry bar to move the slack adjuster and check the brake’s free play – how far the center of the large clevis pin moves before the brake shoes come in contact with the drum. Free play should be between 3/8 and 5/8 of an inch.

How much play is allowed in a slack adjuster?

How often should slack adjusters be greased?

Every six months or 50,000 miles, grease the slack adjuster using an approved grease. The adjusters have a grease fitting to allow lubrication during normal chassis servicing.