Tech Tip: Checking automatic slack adjuster torque

Tips for checking automatic slack adjuster torque


Keeping automatic slack adjusters operating at peak performance is key to safety and regulation compliance. When verifying a Meritor Stroke Sensing ASA’s operation, the manufacturer recommends to always remember to check ASA torque to determine if replacement is needed.

  • Verify the snap ring is correctly secured on the camshaft.
  • Check slack adjuster gear torque – use a lb./in. torque wrench and turn adjusting nut counterclockwise to rotate the gear 360 degrees, or 22 turns of the wrench, as you read the torque scale on the wrench. The value should be less than 45 lb./in. (5 N●m) as you rotate the gear.
  • If the torque value is less than 45 lb./in. (5 N●m) as you rotate the gear, the slack adjuster is operating correctly.
  • If the torque value exceeds 45 lb./in. (5 N●m) as you rotate the gear, replace the slack adjuster.

Important notes:

  • Verify brake slack adjuster position (BSAP) for the type of chamber (standard or long stroke) is correctly set.
  • Verify the use of the proper clevis for the type of chamber (standard or long stroke) and BSAP.

This Tech Tip was provided by Meritor.

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