2023 OWNER’S MANUAL
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fresh out of the bottle.) Older brake fluid (about 18 months) with
even three percent (3%) moisture content lowers the boiling point
to 293oF/145oC, which is dangerously close to the minimum
standard requirements.
Water contamination increases the danger of brake failure
because vapor pockets can form if the fluid gets too hot. Vapor
displaces fluid and is compressible, so when the brakes are
applied, the actuator may completely compress without applying
the brakes.
In addition, water laden brake fluid promotes corrosion and pitting
in caliper pistons and bores, wheel cylinders, master cylinders,
steel brake lines and reverse solenoids.
Consumers must use only DOT 3—preferred—or DOT 4 brake
fluid. DO NOT USE DOT 5 BRAKE FLUID. DOT 5 FLUID WILL DAMAGE
THE SEALS IN THE ACTUATOR AND CALIPERS, CAUSING FAILURE
OF BRAKES THAT COULD LEAD TO INJURY OR DEATH. Any other
type may not provide sufficient chemistry to protect against
overheating. Brake fluid should be completely replaced during
annual maintenance (at least once every 12 months or more
often if the system has shown evidence of brake fluid loss).
Brake fluid types should never be mixed. Failure to provide
required maintenance can cause brake failure, leading to
incidents that result in serious injury or even death.
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
prevents 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 connection
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. Corrosion
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 of use, used brake fluid in the typical 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 fluid’s boiling point temperature results. As
little as one percent (1%) moisture can lower the boiling point to
369oF/187oC.
According to DOT and OEM requirements, brand new DOT 3
brake fluid must have a dry (no moisture) boiling point of at least
401oF/205oC, and a wet (moisture saturated) boiling point of no
less than 284oF/140oC. (Most far exceed these requirements,
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