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7.2.4.4 Brakes, Hydraulic (Vacuum, Air or Electric Operated)
If your trailer has hydraulically-operated brakes, they function the same way the hydraulic
brakes do on your tow vehicle. The hydraulic braking system must be inspected by a dealer; at
least as often as the brakes on the tow vehicle, but no less than once per year. This inspection
includes an assessment of the condition and proper operation of the wheel cylinders, brake
shoes, brake drums and hubs.
You must check the fluid level in the master cylinder reservoir at least every three months. If
you tow your trailer an average of 1,000 miles per month in a hot or dry environment, you must
check the brake fluid level once a month. The brake fluid reservoir is located in an interior
compartment of the trailer. Fill with DOT 4 brake fluid.
7.2.4.4.1
Vacuum-Operated Hydraulic
When towing a trailer, the vacuum gauge, which is located inside the cab of the tow vehicle,
must indicate 18in. Hg. (inches of mercury) or more at all times.
WARNING
7.2.4.4.2
Air Pressure-Operated Hydraulic
Air/hydraulic braking systems are typically used when the tow vehicle has a diesel engine. The
tow vehicle has an air compressor that routes the air to an air/hydraulic mechanism, which
sends brake fluid to the wheel cylinders.
The air pressure gauge in your tow vehicle indicates the current air pressure. See your tow
vehicle manual for the proper air pressure.
7.2.4.4.3
Electric-Operated Hydraulic
Electric/hydraulic braking systems, which are mounted on the trailer, use a small electrically
driven pump to generate hydraulic pressure, which operates the brake cylinders. Like electric
brakes, an electric/hydraulic braking system is operated by an electrical signal from the tow
vehicle.
7.2.5
Trailer Connection to Tow Vehicle
7.2.5.1 Coupler and Ball
The coupler on the trailer connects to the ball attached to the hitch on the tow vehicle. The
coupler, ball and hitch transfer the towing forces between the tow vehicle and the trailer.
Before each tow, coat the ball with a thin layer of automotive bearing grease to reduce wear
and ensure proper operation; and check the locking device that secures the coupler to the ball
for proper operation.
If the vacuum gauge in the tow vehicle is not at or above 18 in. Hg. (inches of mercury),
damage to the brake system will result and the brakes may become inoperable.
Summary of Contents for Gooseneck
Page 1: ...Owner sManual ...
