Proper clearance between the rotors and brake pads is necessary for cor-
rect brake operation. Brake pad clearance which is too small will result in
overheated brake linings. Brake pad clearance which is too large will result
in insufficient braking force and improper parking brake operation. A static
brake adjustment procedure will approximate the proper brake pad to rotor
clearance. The spring brakes remain released throughout the static brake
adjustment process. After the static brake adjustment procedure verify the
brake pad clearance by measuring how far the brake chamber rod extends
when the brakes are applied.
NOTE: If the emergency brake has automatically set due to low air
pressure, start and run the engine until full air system pressure is
obtained. Release the emergency brakes.
Static Brake Adjustment:
1. Set the static distance between the brake pad and rotor by
rotating the adjusting nut on the slack adjuster counterclock-
wise until the nut stops. The brake pad should be firmly
against the rotor.
2. Using a flat blade screwdriver hold the adjusting nut locking
pawl open. Rotate the adjusting nut clockwise ¾ turn.
3. If applicable, uncage the spring brakes and return the caging
tool to the storage position.
Verifying the Brake Adjustment:
The proper clearance of the brake pads should now be verified. The brake
chamber rod will extend when a brake application is made. The distance the
rod extends must fall within specification. Measure the distance on each
brake chamber rod.
WARNING: Keep all fingers and loose clothing clear from moving
brake components.
Chassis Information
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S I G N A T U R E
1 0 • 3 0 7
Adjusting the Brakes
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