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2023 OWNER’S MANUAL
ELECTRIC-OVER-HYDRAULIC
BRAKES (OPTIONAL):
Electric-over-Hydraulic (EOH) brakes utilize an electrical
signal from a vehicles OEM or aftermarket brake controller to
activate a hydraulic brake pump that will apply the trailer brakes.
MasterCraft utilizes the HydraStar™ Hydraulic Brake Actuator in
this application. The HydraStar™ Actuator is installed inside the
tongue assembly of your MasterCraft Trailer.
EOH brakes oer a smoother and stronger brake application
when compared to surge brakes, however, the tow vehicle being
used MUST be fitted with an electronic brake controller and the
appropriate 7-pin trailer connector.
Because the HydraStar™ Actuator is a hydraulic pump, it may
overheat in certain situations when the brakes applied for
extended periods of time, such as railroad crossings or trac
jams. It is important to apply the parking brake on the tow
vehicle and release the brake pedal so that the pump does not
run continuously.
The emergency breakaway system on the MasterCraft EOH
system utilizes a battery installed in the trailer tongue to activate
the pump in the case that the trailer becomes separated from
the tow vehicle. It is critical to ensure the battery is maintained
and properly charged before towing the trailer. In typical use, the
battery is charged when connected to the tow vehicle.
After periods of storage, the battery may have lost charge and
must be recharged or replaced before towing.
The breakaway system is NOT to be used as a parking brake.
The HydraStar™ unit may overheat and/or discharge the battery
resulting in loss of braking pressure.
Proper operation should be tested before use. For a simple test,
perform the following steps:
• Attach the trailer to the tow vehicle
• Pull the breakaway switch on the trailer.
• Listen for a hum from the tongue, the sound will change as the
unit builds pressure.
• This shows that the battery has charge and the pump is working.
• Reset the breakaway switch to turn the actuator pump off.
• Turn the vehicle ignition and brake controller on.
• Depress the brake in the tow vehicle.
• The hydraulic pump should activate when the brake pedal
is pressed.
• This shows that the wiring is correct.
• The above steps show that the pump is working but the disc
brakes still need to be tested.
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