ECN 04007 Manual 440-1008 Rev D Page 5 of 10
Note – The Hydrastar™ actuator does not draw power from the tow vehicle accessory lead unless
the brakes on the tow vehicle are actuated.
IMPORTANT – CONSULT YOUR VEHICLE OWNER’S MANUAL
Be sure to read your vehicle owner’s manual to see what it says about vehicle to trailer wiring.
More and more vehicle manufacturers are recommending special precautions be
taken to protect the more sophisticated electronics on the newer vehicles.
D. TEST ELECTRICAL OPERATION
1. Attach trailer to towing vehicle.
2. Pull the breakaway switch. The Hydrastar™ unit should run. If the unit does not run, check battery condition
and system wiring. Reset the breakaway switch, which will turn the unit off.
Note: When the unit is running the motor will generate a “hum” that changes pitch as the unit
builds pressure.
3. Turn the ignition switch on and turn the in cab electronic brake controller on. The Hydrastar™ unit should run
whenever the brake pedal is depressed. If the unit does not run, check system wiring.
CAUTION – Testing the Hydrastar™ unit confirms that it is operating. It does not confirm that
the brakes are operating properly. Regular inspection, adjustment, and maintenance of the
brakes, lines, hoses, drums, discs, fluid, and other associated components is necessary to ensure
proper brake operation.
E. BLEEDING AND ADJUSTING THE BRAKES
1. It typically is much easier to bleed the brakes with two people working together or use of a power
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