![]() Free stroke less than 3/8” can cause brake drag. Ensure there is at least 3/8 ” of free stroke. Take a free stoke measurement as outlined in the section entitled Failure Analysis. Measure the chamber power stroke at 80-90 psi as described in subsection “B”, “Self-Adjusting Brake Adjuster Brake Adjustment Procedure”, below. The actuator stroke should be as short as possible without brakes dragging. ![]() After establishing solid shoe-to-drum contact, back off the adjusting hex 1/4 turn for worn linings and 1/2 turn when relining brakes. If there is movement, adjustment was made in the wrong direction and the adjusting hex must be turned in the opposite direction until it will not go no further. Pull on the brake adjuster to make sure it will not move. With the locking sleeve fully depressed, use the wrench or socket to turn the adjusting hex until it will not go further indicating that either the shoes have contacted the drum or the adjusting hex has been turned in the wrong direction. ![]() Position a wrench or socket over the adjusting hex and disengage the locking sleeve by depressing it. If the vehicle cannot be jacked up, thoroughly clean up the adjusting hex and locking sleeve area. The actuator should be as short as possible without the brakes dragging. Then back off the adjusting hex until the tyre and wheel turn freely. Use the wrench or society to turn the adjusting hex until the shoes contact the drum. With the locking sleeve fully depressed, adjust the brakes while rotating the tire and wheel. Thoroughly clean the adjusting hex and locking sleeve area. NOTE: All adjustments should be made with cold brake drums and brakes fully released.īrake adjusters with locking collar (positive lock type) - Jack up the vehicle. Adjust the brakes by following the procedure in the next section entitled Brake Adjustment Procedure. Check to ensure that all the brake adjusters rotate freely and without binding. Tighten the jam nut on the push-rod-to-clevis attachment (1/2-20 300-400 in.lbs.5/8-18-400 in.lbs)Īfter installation, make sure that there is adequate clearance in both the fully applied and fully released positions. Install the brake adjuster retaining mechanism at the end of the brake camshaft and make sure to shim it to less Tan 0.060 inch of end play. Install the clevis pin and secure it with a new cotter pin.Ĭheck and make sure the angle formed by the brake adjuster arm and the brake chamber push rod is greater than 90° when the brake adjuster is in the released position. Install the brake adjuster on the cam shaft so that the adjustment hex and grease fitting (if so equipped) are accessible for servicing.Īlign the brake adjuster arm with centre of the push rod clevis. Remove the brake adjuster from the spline end of the brake cam shaft. Rotate the adjusting hex to back the brake adjuster out of the clevis.Ĥ. Remove the retaining mechanism from the end of the brake camshaft.ģ. Remove the brake chamber push rod clevis pin.Ģ. Spring brakes must be mechanically caged or released with air. Always block the wheels or mechanically secure the vehicle. To avoid possible injury, proper precautions must be taken to prevent automatic actuation of the brake chambers while removing or installing slack adjusters. Manual Slack Adjusters – Download ĭeWe Manual Slack Adjusters – Download
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