5
Adjusting the Power to the Trailer
Brakes
(Prior to setting Boost)
Once the control has been securely mounted, it is
necessary to set the power needed to stop the trailer
during a braking event.
1. Connect trailer to tow vehicle.
2. With engine running set power (with Power
Buttons) to indicate 6.0
3. Drive tow vehicle and trailer on a dry level paved
surface at 25 mph and fully apply Manual Knob.
✓ If trailer brakes lock up:
❑ Turn power down using Power Buttons.
✓ If braking was not sufficient:
❑ Turn power up using Power Buttons.
4. Repeat Step (3) until power has been set to a point
just below wheel lock up or at a sufficient force as
to achieve maximum braking power.
5. Using the brake pedal, make a few low speed
stops to check the power setting. Trailer braking is
initiated and terminated via the stoplight switch.
When the brake pedal is released, trailer braking
will cease.
Boost Setting
The boost button was designed to allow a more aggressive
setting for your trailer brakes and is available in three
levels - B1, B2, B3. Each incremental boost setting
increases the sensitivity of the P3’s inertial sensor,
enhancing the participation of the trailer brakes during a
braking event.
Truck/Trailer B1 icons on the screen indicate Boost On.
For example: W
ith the boost off
, during a braking event,
the power to the brakes starts out at zero and increases
with deceleration. W
ith the boost on level 1
,
B1, during a braking event, the power automatically starts
out at approximately 13% of the power setting and
increases with deceleration. W
ith the boost on level 2
,
B2, or with the boost on le
vel 3
, B3, during a braking
event, the power automatically starts out at approximately
25% of the power setting and increases with deceleration.
Some cases where you might want to use the boost button:
• You like the trailer braking to ‘LEAD’ the tow
vehicle’s braking
• Towing a full vs. empty trailer
• Degraded brake performance (most electric brakes
require manual adjustment - see Appendix A or a
dealer for adjustment or repair)
(Boost Setting continued on next page)
Boost On
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