Brake
controllers
have gone
from a
simple
timing
device to
pendulums
to the
modern
accelerometer
driven
devices
most of us
use today.
The
overriding
theory has
always
been that
you want
your
trailer
brakes to
engage at
precisely,
or
slightly
ahead, of
the
tow-vehicle's
brakes. Of
course, no
one has
invented a
brake
controller
that can
read minds
(yet), so
every
manufacturer
has had to
fall back
on the one
common
event that
occurs
every time
a tow
vehicle's
brakes are
applied:
illumination
of the
brake
lights.
Your
car or
truck's
brake
light
comes on
the moment
the brake
pedal is
pushed,
slightly
before any
brake
pressure
is
actually
applied.
Brake
control
manufacturers
take
advantage
of this by
tapping
into that
circuit
(called
the
"Brake
Light
Wire"
by most)
and
sending a
small
amount of
power to
the
trailer
brakes the
moment
it's
detected.
That's how
your
trailer
stops
"ahead"
of the tow
vehicle.
After
that, the
brake
controller
sends a
greater or
lesser
amount of
power to
the
trailer
brakes,
depending
on the
input from
the
accelerometer,
cable to
the brake,
hydraulic
pressure,
or
pendulum
position,
depending
on which
type of
brake
controller
you have.
Coby H
:
This is a great series of articles. Thanks.
Romney K
:
I believed that the best solution was electric/hydraulic but the low cost way is the way to go. I've used Hensley for years and always been happy but I wondered if there was something better at a higher cost. I think not after reading these articles. Many thanks
TPK
:
I always thought that the controller needed to respond to the brake system in order to get the timing right between the puller and pusher. I think I understand it better now but I still don't understand the proportional braking problem. I have a 2006 Jayco with a Hensley and so far so good. I think the best way to go is a motorcoach towing a car - the big one towing the little one. If you need to get to the little one towing the big one I think you really need a Hensley. Great articles. Thanks.
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