Following is a comprehensive test of InvisiBrake
functions. We recommend that you perform this test
before each towing season.
Test InvisiBrake main functions
The following tests can be performed with the mo-
torhome and towed vehicle stationary.
1. Confirm braking — with the motorhome engine run-
ning, depress and hold the motorhome brake pedal
down. The towed vehicle’s brake pedal will be de-
pressed. Then, release the motorhome brake pedal.
At the towed vehicle, the brake pedal will retract.
2. Confirm that the motorhome monitor is function-
ing — the LED will illuminate after the motorhome’s
brake pedal is depressed and stop illuminating when
the brake pedal is released.
3. Confirm the proper operation of the extend-
ed braking protection mode — depress and hold
the motorhome’s brake pedal down. The towed ve-
hicle’s brake pedal will be depressed. After approxi-
Test InvisiBrake
5
mately 15 seconds, the brake pedal will retract, eve n
though the motorhome brake pedal is still depressed.
4. Confirm the proper operation of the audio alert
— in the towed vehicle, depress and hold the brake
pedal down. After approximately 20 seconds, the audio
alert will sound in the motorhome. (To cancel the audio
alert, release the towed vehicle’s brake pedal.)
If InvisiBrake fails any of the above tests, you
must refer to the “Troubleshooting” section and
repair the fault before towing.
Test the break away system
1. Pull the large ring on the break away pin (Figure
2) out of the break away switch (Figure 2). The towed
vehicle’s brake pedal will be depressed when the pin
is pulled. Insert the pin back into the switch. The brake
pedal will be released.
Troubleshooting
Symptom
Nothing happens after
proper installation, or In-
visiBrake only operates
sporadically.
InvisiBrake activates un-
expectedly.
Solution
• Make certain the 20-amp fuse was installed during the installation.
• Make certain that InvisiBrake is connected to a full-time power supply — some
vehicles have an automatic shut off feature, some require you to pull a fuse for
towing and some require the battery to be disconnected for towing.
• Make certain that the check valve was installed with the arrow pointing toward
the engine.
• Check all electrical connections, with particular attention to the ground between
the motorhome and towed vehicle.
• Pull the break away switch. Does InvisiBrake activate? If not, you likely have a
bad ground. Test the ground by connecting a temporary wire between both vehicles’
chassis, then apply the motorhome’s brakes. If InvisiBrake now activates, you have
a bad ground.
• Make certain that InvisiBrake is receiving a brake light signal from the motorhome.
(Is the motorhome engine on? Many motorhomes do not supply enough voltage to
activate InvisiBrake unless the engine is running.)
• The InvisiBrake wiring was connected downstream of the diodes. Reconnect the
wiring upstream of the diodes.
• Inspect the brake pedal clamp, pulley and cable anchor bracket. Make certain
that they are installed correctly and that the cable is routed properly.
• The operating temperature range is between -2° and
+
150° F (-19° to
+
66° C).
InvisiBrake will not operate at temperatures above or below this range.
Is the monitor wiring conducted through the power cord? (The monitor wiring
on both vehicles has been attached to open terminals on both vehicles’ electrical
sockets.) If so, a silicone sealant must be applied to both attachment points. Oth-
erwise, moisture and/or corrosion may cause unintended activation.
continued on next page
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