Test the system;
evaluate the brake pressure setting
continued from preceding page
• Brake pressure set too high
— a sharp pull at
the motorhome indicates that the brake pressure is set
too high — in this case, you may choose to lower the
setting until the towed vehicle brakes with less force.
See “If necessary, change the brake pressure setting,”
below.
It is possible to lower the brake pressure set-
ting to the point that it negates the benefit of the
supplemental braking system and break away. In-
sufficient brake pressure will lengthen stopping
distance.
• Brake pressure set too low
— if the combination
of vehicles takes longer to stop than the motorhome
alone, you may choose to raise the setting. See “If nec-
essary, change the brake pressure setting,” below.
If brake pressure is set too high, InvisiBrake will
apply excessive force to the towed vehicle’s brake
pedal, which will cause tire and brake system dam-
age, as well as other consequential, non-warran-
ty damage.
If necessary,
change the brake pressure setting
1.
Pull the break away pin (Figure 15). The pressure
gauge on the controller (page one) will display the cur-
rent braking pressure.
CAUTION
Reinsert the brake away pin within five minutes,
or premature compressor failure may result.
2.
Pull out on the brake pressure adjustment knob
(page one) to unlock it. Turn the knob clockwise to
increase the braking pressure or counterclockwise to
decrease the braking pressure.
3.
Adjust the pressure in increments of 10 psi.
4.
Push the brake pressure adjustment knob in to lock
it in place. Reinsert the break away pin.
5.
Repeat the test drive and, if necessary, adjust again
until you are satisfied with the brake pressure setting.
Every time you adjust the brake pressure, you
must test drive the motorhome and towed vehicle.
After repetitive braking, check for excessive heat
near the center of the towed vehicle’s wheels — this
indicates that the brakes are overheating and that
the brake pressure is set too high.
You must lower the braking pressure and re-test
until the brakes are not excessively hot.
Failure to follow these instructions may cause
brake failure, resulting in property damage, per-
sonal injury or even death.
Finish the installation
The installation and tests are complete. If necessary,
replace any trim panels that were removed to install
the controller.
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