| Brake
Controllers
Trailer brakes are required
in many states for trailers
over 1,000-3000#, so an electric
brake controller becomes an
important part of safe towing.
In theory, the tow vehicle
brakes should be strong enough
to stop the tow vehicle loaded
up to its GVWR. And I’m
sure there is some sort of
extra safety margin built
in to handle some added weight
from a trailer that does not
have brakes. Also in theory,
the trailer brakes should
be strong enough to stop the
trailer. How quickly the trailer
would stop on its own, like
in a break-away situation,
I’m not sure.
The brake controller basically
supplies power to the trailer
brakes when the tow vehicle
brakes are applied. They are
adjustable to fit the particular
tow vehicle and trailer combination
as well as the driver’s
braking habits. But that’s
where the similarity ends.
There are basically three
types of brake controllers;
time based, inertia based
and proportional.
Time based controllers
Supply an increasing amount
of voltage to the trailer
brakes over time. The longer
a tow vehicle’s brake
pedal is pressed, the more
voltage is sent to the trailer
brakes, up to a point. How
much and how fast the voltage
is supplied to the trailer
brakes is adjustable. Time
based controllers are the
most common type.
There are a few drawbacks
to this type of controller.
The biggest problem is consistent
braking. If you can make every
stop almost the same, relative
to speed and stopping distance,
you probably wouldn’t
have any noticeable problems
with this type of controller.
But what about those stops
that are more gradual or more
hurried? During the more gradual
stops (or slowing), you might
feel some tugging or jerking
from the trailer. During the
hurried (or panic) braking,
you may feel like the trailer
isn’t stopping and is
going to push you into whatever
it is you are trying to avoid.
Should one of these situations
arise, you may want to check
out the other types of controllers.
Inertia based controllers
Use sophisticated electronics
(some better than others)
to sense how quickly the tow
vehicle is slowing or stopping
(a change in vehicle inertia)
and supplies the appropriate
voltage to the trailer brakes.
This type of controller is
much smoother than the time
based.
I happened to have the opportunities
for a little testing of the
Voyager and Prodigy controllers.
Coming home from one of the
last trips when I still had
the Voyager installed, I was
driving over the crest of
a hill on a curve at about
35 mph. It had rained earlier
so the roads were still wet,
but it wasn’t raining
at the time. Just over the
hill and around the curve
was a traffic light. As I
approached, it turned yellow,
and I though I had plenty
of time and space to stop,
although it would be a slightly
quicker stop than what I would
normally do. But as I applied
the brakes, I didn’t
feel like things were going
to stop in time. Fortunately,
there was nobody in front
of me so I aborted the stop
and went through the intersection
just as the light turned red.
I had been thinking about
upgrading to the Prodigy for
some time before this, and
this made it clear I needed
something better, so I got
the Prodigy and installed
it a few weeks later. After
a few more trips out with
the Prodigy installed and
without incident, guess what
happened? Yep, the same thing
on the same road at the same
intersection, but this time
it was raining. This time
I was ready (but I’m
always ready for a traffic
light to turn yellow anyway).
When the light turned yellow,
I said to myself, “Okay,
let’s see what this
Prodigy will do.” This
time I kept on the brakes
and everything came to a nice
smooth stop. That sold me
on the Prodigy. |