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debris, or from being stepped on. Failure to protect the actuator
from damage can cause the unit to malfunction and void the
Dexter warranty.
Mounting consideration should be given to the following:
1. The unit must be level, with the filler neck up.
2. It is the responsibility of the installer to provide necessary
fasteners for attachment of the actuator to the trailer.
3. Mount unit where it will not be submerged in water.
4. Mounting near the hitch is preferred. Do not mount near the
trailer axles or rear of the trailer.
CAUTION
The Dexter DX Series brake actuator contains sensitive electronics
that must be protected. Drilling additional holes in the housing,
electrostatically painting, or welding anywhere on the unit will
damage the unit making it inoperable and will void the manufacturer's
warranty. Always remove the unit from the trailer before doing any
welding repair or modifications to the trailer structure.
Connect the trailer brake lines to the actuator as follows:
1. Remove the rubber or plastic plug from the 3/16" inverted flare
brake port.
2. Brake line must be compatible with DOT 3, DOT 4, or DOT 5
brake fluid.
3. Flush existing brake system and lines until they are free of any
contaminants using DOT 3, DOT 4, or DOT 5 brake fluid prior to
connecting to the Dexter DX Series brake actuator.
4. Connect the brake line from the trailer brakes to the 3/16"
inverted flare fitting on the actuator. Do not tighten the 3/16"
brake line adapter more than the 22 Ft. Lbs. used at factory
installation.
CAUTION
Do not overfill fluid reservoir. Fluid will expand. Max fill level is
3/8" below bottom of filler neck.
Air Gap
Fill the unit with DOT 3, DOT 4, or DOT 5 brake fluid, while maintaining a
3/8" air gap below the filler neck.
DX SERIES SERVICE MANUAL
ELECTRIC/HYDRAULIC ACTUATORS
CAUTION
Always use new DOT 3, DOT 4, or DOT 5 brake fluid from a sealed
container. Never attempt to reuse old or dirty fluid. Do not overfill
the unit. Take care to protect painted surfaces from contact with
the brake fluid. Wash off any spilled brake fluid.
Mount the emergency breakaway switch and emergency breakaway
battery on the trailer, as detailed in the instruction sheets provided with
the emergency breakaway kit.
Bolt Mounting Pattern
2-1/2"
(63.5mm)
Electrical Wire Colors and Function
CAUTION
Only use a maintained battery with no less than 12.5v (see
battery chart below). Testing with a battery charger or other
device will cause loss of function.
% Battery Charge Chart
0%
20%
40%
10.5v
11.66v
11.96v
CAUTION
Undersized wire will increase electrical resistance and will prevent
proper operation of this unit.
BLACK – 30 amp 12 volt supply from tow vehicle*
BLUE – Output from electronic brake controller in tow vehicle
WHITE – Trailer and tow vehicle ground
YELLOW – Cold side of breakaway switch
It is important that wire lengths for the BLACK power lead and WHITE
ground lead be no longer than 25 feet from the DX Series brake
actuator to the supply power (i.e. on board trailer battery or the tow
9-13/16"
(250mm)
60%
80%
100%
12.24v
12.5v
12.73v
2021.02 | 3
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