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expectations, have the tow vehicle and
the trailer brakes checked for proper
operation. The trailer brakes should be
inspected by an authorized MasterCraft
dealer.
Review the tow vehicle manufacturers
recommendations and instructions for
towing.
If the brakes are hot, before launching it
is a good idea to allow the brakes to cool
rst. The sudden change in temperature
when submerging very hot calipers and
rotors stresses all the parts and could
cause damage.
If you are unable to back-up, check the
electronically operated back-up valve
on the actuator, which is connected to
the tow vehicle back-up lights. When
energized, the valve opens and pre-
vents pressure build-up in the system.
When it is energized by shifting the
tow vehicle into reverse, you should
hear a noticeable “click” sound. If you
don’t, check that the electrical connec-
tion between the tow vehicle and the
trailer is secure.
When parking the trailer, be sure the
actuator is fully extended. This position
relieves pressure on the brakes. Cor-
rosion sometimes causes actuators to
freeze in the compressed position. This
causes the brakes to drag and overheat
during subsequent outings.
Recommended Brake Fluid
After only a year, used brake uid in the
average marine trailer may contain as much
as two percent (2%) water. Over time, the
percentage will continue to grow and may
reach as much as eight percent (8%). As
the concentration of moisture increases, a
sharp drop in the uid’s boiling tempera-
ture results. As little as one percent (1%)
moisture can lower the boiling point to
369
o
F/187
o
C.
According to DOT and OEM require-
ments, brand new DOT 3 brake uid must
have a dry (no moisture) boiling point of
at least 401
o
F/205
o
C, and a wet (moisture-
saturated) boiling point of no less than
284
o
F/140
o
C. (Most far exceed these re-
quirements, fresh out of the bottle.) Older
brake uid (about 18 months) with even
three percent (3%) moisture content low-
ers the boiling point to 293
o
F/145
o
C, which
is dangerously close to the minimum stan-
dard requirements.
Water contamination increases the dan-
ger of brake failure because vapor pockets
can form if the uid gets too hot. Vapor dis-
places uid and is compressible, so when
the brakes are applied, the actuator may
completely compress without applying the
brakes!
In addition, water-laden brake uid
promotes corrosion and pitting in caliper
pistons and bores, wheel cylinders, master
cylinders, steel brake lines and reverse so-
lenoids.
MasterCraft Trailers • 2014 MasterCraft Owners Manual Page 7-21
M A S T E R C R A F T T R A I L E R S
246


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