Warner Electric Electric Wheel Brake 12-1_4 x 3-1_2 Installation Instructions - Manual (Page 8)

8 Warner Electric • 800-825-9050 A-216 • 819-0244
Towing Products Required with Your
12-1/4" x 3-1/2" Brakes
The following section, “Towing Products
Required with Your 12-1/4" x 3-1/2" Brakes,”
describes associated controls and components
necessary to complete your brake system
installation. Please read it carefully.
Controller
Warner Electric has one controller available
specifically for use with the 12-1/4" x 3-1/2"
brake. The Utility Controller, Warner Electric part
number 1300-76, is rated at 30 amps and 4, 6 or
8 brakes. This controller is designed to properly
synchronize the towing vehicle and trailer
brakes. Using other controllers may result in
excessive trailer brake torque causing jerky
braking and poor towing vehicle-to-vehicle
braking synchronization.
Warner Electric’s Utility Controller has an
adjustment knob to control trailer brake torque.
Labeled “More” (braking power) and “Less”
(braking power), this adjustment does not affect
maximum braking capacity of the trailer brakes.
Because of the wide variety of towing vehicles
encountered, balancing towing vehicle brakes
and trailer brakes is necessary for smooth,
synchronized stops. To achieve this, the
controller adjustment should be set to provide
a slight lead in trailer braking over towing vehicle
braking. Turning the adjustment knob in the
“More” direction will increase the trailer brake
rate of application, while turning in the “Less”
direction will decrease the trailer brake rate of
application. When proper adjustment has been
achieved, there should be no sensation of the
trailer pushing or pulling the towing vehicle
during a stop. When this setting has been
reached, no further adjustment should be
required. For operating with varying load
weights, read the following section on “Load
Control.”
Load Control
The installation of 12-1/4" x 3-1/2" brakes on
any trailer which will operate with loads less than
rated capacity or with varying loads requires a
load control, Warner Electric part number
1300-78, to be installed in the towing vehicle.
The Warner Electric Load Control compensates
for trailer load variations by limiting the
maximum torque output of the brakes by adding
dropping resistance in the electrical control line.
When towing a trailer loaded to brake rated
capacity, the Load Control must be set at
maximum braking. When pulling an empty or
partially loaded trailer, the Load Control must be
set between maximum and minimum braking at
a position just before the point at which trailer
tire skidding occurs when actuating the hand
control fully on. Failure to install and use the
Warner Electric Load Control will result in
excessive brake torque when stopping a trailer
loaded to less than brake capacity.
Front Axle Resistor
The Warner Electric Front Axle Resistor, part
number 1100-41, is designed to balance braking
forces between front and rear axle on two-axle
trailers. Utility trailers with tandem axle rocker
arm suspension present a typical application.
This suspension tends to transfer weight from
the front axle to the rear axle during braking,
allowing the front wheels to prematurely lock
and skid. By automatically reducing the current
flow, the Warner Electric Front Axle Resistor
reduces front axle braking forces to improve
brake balance, reduce tire wear, and minimize
the wheel lock-up.