Warner Electric Electric Wheel Brake 12-1_4 x 3-1_2 Installation Instructions - Manual (Page 5)

5 Warner Electric • 800-825-9050 A-216 • 819-0244
c. Install the rivets according to the drum
manufacturer’s recommendations.
d. Install the brake drum according to the
manufacturer’s recommendations.
E. Adjusting the Brake
1. New brakes come pre-adjusted from the
factory and normally should not require
additional adjustment when mated with
new drums. The drum should, however,
be checked for freedom of rotation after
mounting. If dragging occurs, the brake
must be readjusted.
2. Brakes should always be readjusted when
they are installed with remachined drums.
Note: Brakes should never be installed in
used drums without remachining the drum
braking surface.
3. Follow these instructions to adjust the brake:
a. Remove the adjuster plug located at
the bottom of the brake and insert an
adjusting tool (see Figure 4).
Figure 4 - Brake Adjustment
b. With the wheel off the ground, expand
the shoes until the brake drags
significantly. The shoes are expanded
by the upward motion of the adjusting
tool which turns the adjusting nut.
c. Back off the adjuster (downward motion
of the adjusting tool) until the wheel turns
freely, usually 4 to 5 notches on the
adjusting nut.
d. Replace the plug to keep out dirt and
moisture.
e. Brake readjustment is recommended after
the first 500 miles of operation (when
shoes and drums have been seated).
F. Installing the Trailer Brake Wiring
1. Wire the brakes in parallel according to the
wiring diagram (Figure 5).
2. Use good quality, insulated, crimp-type
connectors that fit 1/4-inch diameter
terminals to attach the wires to the brake.
3. Remove the top nut, and check that the
bottom nut remains tight.
4. Install one connector over each 1/4-inch
stud terminal with a star washer under the
connector. Lock into place with the top nut.