Part 4 - Myth
#2:
Proportional
braking is
the key to
smooth
trailer
braking
Brake
controller
manufacturers
have been
attempting
to line up
your
tow-vehicle
brakes to
your
trailer
brakes for
decades.
The theory
is that if
both sets
of brakes
are
applied at
precisely
the same
time,
smooth
braking
will be
accomplished.
Here's
the
problem:
the
hydraulic
disc
brakes in
your
tow-vehicle
do not
function
the same
as the
electric
drum
brakes in
your
trailer.
Thus the
recent
popularity
of
hydraulic
trailer
brakes, a
very
expensive
"cure"
for the
problem.
The fact
is,
electric
drum
brakes are
more
efficient
at low
speeds and
hydraulic
disc
brakes are
more
efficient
at high
speeds.
Therefore,
applying
the same
amount of
braking to
both sets
of brakes
actually
exacerbates
the
problem.
It would
be like
putting a
distance
runner and
a sprinter
on the
starting
line
together
and
expecting
them to
always
finish
together,
no matter
the
distance.
To
date, the
best
solution
to this
problem
has been
electric/hydraulic
disc
brakes for
the
trailer,
an option
that runs
into
thousands
of
dollars.
Hydraulic
brakes,
however,
have their
own
problems,
the
biggest
being the
inherent
delay, as
much as a
half
second,
between
pressing
the brake
pedal and
the
activation
of the
hydraulic
actuator.
Ironically,
the best
brake
controllers
for this
type of
system
have
always
been the
low cost
timer or
pendulum
based
controllers,
which
don't
allow for
every
condition
and are
still
limited by
the gain
setting.
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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