Setup Instructions

Setup Instructions Page 31
How to Synchronize the Electric Brakes
Before operating the MH-400 for the first time, the
electric brakes must be synchronized to the tow vehicle’s
brakes (so that they operate at the same time).
The MH-400 and the tow vehicle will seldom have the
correct amperage flow to the brake magnets to provide
comfortable, safe braking. Changing the load weight, as
well as uneven alternator and battery output, can result in
unstable current flow to the brake magnets.
The electric brake controller provides a modulation
function, which varies the current to the electric brakes
according to the pressure on the brake pedal or the
deceleration of the tow vehicle.
• The brake controller must provide about 2 V to the
braking system when the brake pedal is first
depressed.
• As the brake pressure increases, this should
gradually increase to 12 V.
• If the brake controller jumps quickly to a high
voltage (for example, during a gradual stop), this will
result in harsh, jerky braking and possible wheel
locking.
To properly synchronize the brakes and achieve smooth
braking, you must burnish the brake drums:
• With the MH-400 connected to the tow vehicle,
conduct a driving test on a dry, paved road free of
sand and gravel.
• Depress the brakes repeatedly, 20 to 30 times. Each
time, decrease your speed by about 20 km/h
(12 mph).
• Next, from a speed of 24 km/h (15 mph), make
several hard stops.
• If the MH-400 brakes lock and slide, decrease the
gain setting on the controller. If they do not slide,
slightly increase the gain setting. Adjust the
controller to the point just before the brakes lock up
and the wheels skid.
• If the controller is applying the MH-400 brakes
before the tow vehicle brakes, adjust the controller so
that the MH-400 brakes are applied at the same time
as the tow vehicle brakes.