Understanding
Trailer Brake Controllers
by: Derek Chastain
An electric trailer brake controller is a device that supplies power
from a tow vehicle to a trailer's electric brakes. There are two types
of brake controllers on the market today - Time Delay Activated and
Inertia Activated.
While the controllers operate differently, they are very similar. Both
types have the same wiring configuration. Both allow the driver to adjust
the amount of braking power and both have a pressure sensitive manual
override switch that can be used to apply the trailer brakes independently
of the tow vehicle.
Time Delay Activated Brake Controls
Time Delay Activated or "solid state" controllers are enabled
by the depressing of the brake pedal in the tow vehicle. Once enabled,
time delay activated controllers apply a gradual voltage to the trailer's
brakes using a Time Delay Circuit.
The advantages of a solid state brake control unit are the inexpensive
cost, low profile, and they can be mounted at any angle. The disadvantages
mostly pertain to Hazard Flashers issues. In most applications the digital
display will flash with the hazard flashers and if the gain is set aggressively,
some pulsing of the trailer brakes may be felt.
Hazard Flasher issues can be resolved by using a Pulse Preventer that
will isolate the brake control from the vehicles flashers, thus eliminating
the pulsing.
Inertia Activated Brake Controls
Inertia Activated Brake Controllers or Pendulum Style controllers are
enabled by the depressing of the brake pedal and activated by a Pendulum
Circuit that senses the stopping motion of the vehicle. The Pendulum
Circuit applies a proportional voltage to the trailer's brakes.
When the Inertia activated brake control is properly adjusted, the trailer
will decelerate at the same speed as the towing vehicle. A result of
this is increased braking efficiency and reduced wear on the brakes.
Advantages of pendulum style controllers are efficient braking under
a variety of braking conditions including adverse conditions. They also
have a smooth braking motion.
Pendulum style controllers have a few disadvantages also. They tend
to be larger than solid state controller. They usually more expensive
and they must be mounted in a level position. Tekonsha's Prodigy controller
is an exception. Due to its innovative technology, it can be mounted
in almost any position.
Whether the brake control is Timer Activated or Inertia Activated, the
gain can be adjusted by the user. Both feature a pressure sensitive
switch that can be used to apply the trailer brakes independent of the
tow vehicle. Most importantly, both styles achieve the same goal safely
and reliably. Visit http://www.trailerbrakecontrols.com for more information.
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