Coupling To The Tow Vehicle
Bri-Mar
69
actuator's coupler. Place wheel chock blocks two feet behind the trailer
to prevent a runaway trailer.
Place a sturdy board, such as a 2 inch by 4 inch piece of lumber, into the
chain loop below the coupler. The board should be 4 feet or longer so it
will extend several feet above the actuator. Keep the end of the board a
few inches off the ground, and position it to press against the front end of
the actuator's coupler. Press the board towards the rear of the trailer.
Keep pressing the top of the board to stroke the actuator and its internal
master cylinder. If the trailer brake system is operational, the brakes will
apply and keep the trailer from rolling away from you. Properly adjusted
uni-servo or duo-servo type brakes will prevent you from moving the
trailer back more than a few inches. Free-backing type brakes will
initially provide rolling resistance, but continued force on the board will
switch them into free-backing mode, and you'll be able to move the
trailer backwards.
If you have uni-servo or duo-servo brakes, and stroking the actuator (as
described above) causes the trailer to roll away from you freely or with
only minimal resistance, the brakes are NOT applying properly. If you
have free-backing brakes and stroking the actuator (as described above)
causes the trailer to roll away without initial resistance, then the brakes
are NOT applying properly. The brake system MUST be evaluated to
determine the cause of the problem and corrective action MUST be taken
before the trailer is used.
Use this procedure each time you tow your trailer to check your surge
brake system operation.
4.2.7.2 Uncoupling a Bumper Pull Trailer
Follow these steps to uncouple your trailer from the tow vehicle:
•
Block trailer tires to prevent the trailer from rolling, before jacking
the trailer up.
•
Disconnect the electrical connector.
•
Disconnect the breakaway brake switch lanyard or surge brake chain.
•
Disconnect the safety chains from the tow vehicle.
Trailers
Summary of Contents for DT508LP
Page 144: ...Electrical Drawings Bri Mar 138 Trailers...
Page 145: ...Bri Mar 139 9 ELECTRICAL DRAWINGS Trailers...
Page 146: ...Bri Mar 140 Trailers...
