Trailer Brake Hand Control Valve - GMC TopKick 2007 Owner's Manual

Trailer Brake Hand Control Valve

If your vehicle has this feature, the control
is mounted on the floor console.
You can apply the trailer brakes a little or apply
them all the way if you have to. Use this control only
when you are driving. Do not use it for parking or to
hold the rig on a hill.
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This feature lets you
apply the trailer brakes
without applying the
tractor brakes.
CAUTION:
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Using the trailer brake hand control for
parking or for holding the vehicle on a hill
may not keep the vehicle from rolling.
This can happen if someone hits the valve
by accident, or if air pressure bleeds from
the system. If the vehicle rolls, you or
others could be injured. To park the
vehicle or hold it on a hill, use the parking
brake properly.