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U.S. 888-725-9355
Canada 800-387-3889
SLACK ADJUSTERS
Utilizing the correct Automatic Slack Adjuster (ASA) clevis
is critical to maximizing brake life. The use of an incorrect
clevis could result in an increase to operating costs.
Meritor ASAs are sold in the aftermarket less clevis
which allows the end user to properly spec the clevis for the
intended application. Meritor manufactures clevises with pin
spacings of 1.30” and 1.38” to accommodate
a variety of applications. To maximize brake lining life,
it is recommended to replace the clevis when the ASA
is replaced.
When it’s time to replace the ASA, replace the clevis
following the Template Method as outlined here.
Template Method for Replacing the ASA Clevis.
Measure the old clevis, or if the old clevis is not available,
measure the clevis on the opposite wheel end of the axle by
matching the two cutouts on the bottom of the template to
the clevis holes.
1. Use the correct Meritor ASA template to measure the
length of the slack adjuster
1
. The marks by the holes in the
small end of the template indicate the length of the slack
adjuster.
SPEC THE RIGHT MERITOR CLEVIS FOR THE APPLICATION
ASA
Air Brake
Chamber
1
The ASA templates are not interchangeable. The correct ASA template and clevis pin
spacing must be used and the clevis position must be adjusted as described in the
Template Method. If an incorrect combination is used and the clevis is installed in
the wrong position, the slack adjuster will not adjust the brake correctly. If the slack
adjuster under adjusts, stopping distances are increased. If the slack adjuster over
adjusts, the linings may drag and damage the brake.
Measure Slack Adjuster
Arm Length
Camshaft Center
1.38” Clevis
1.30” Clevis