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1.6
Uncaging Air Brakes (for trailers with an Air Brake system)
Air brakes are designed with a safety feature called a spring brake, so that if no air pressure is
present in the system springs will apply force to the brake system linkages and apply the brakes. To
allow the trailer to be moved during shipping a release tool assembly is installed in each of the spring
brake cans to prevent the brakes from being applied. These release tools MUST be removed before
the trailer can be put into service.
INOPERATIVE BRAKE SYSTEM!
The spring brake release tool assemblies must be removed from the spring brake cans before
the trailer is put into service. The brake system WILL NOT
FUNCTION with the release tools installed, and the trailer will roll freely until they are removed.
To remove the release tool assemblies, use the following procedure (see illustration on next
page):
1. Hook up trailer to tow vehicle, and/or put air to the air brake system on the trailer.
2. Apply approximately 70 psi of air pressure to the brake system; this should be sufficient to
remove the spring pressure and loosen the release tool assemblies. NOTE: The release
tools can be removed without applying air pressure to the brake system, although the
removal process is easier if air is applied.
3. Slowly loosen the nut on the release tool until the spring pressure has been released.
4. Rotate the release tool approximately
1/4
turn to align the tee with the slots and pull out.
5. Install the release tool assembly in the storage position on the bottom of the can for future
use.
6. Cover the release tool assembly port with the attached rubber seal.
7. Repeat this procedure for all spring brake cans.
Содержание TRD-54-T
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