Use only DOT-3 brake fluid in the Model 125 actuator. Use a pressure type brake bleeder to bleed brakes. (This type of brake bleeder is
available at your local automotive parts supply store.) Follow manufacturer’s directions. Or, manually bleed the brakes using a
heavy-duty flat blade screwdriver inserted in the hole provided on the top of the actuator near the front. Insert the screwdriver and use
a pumping action to activate the master cylinder in order to bleed the brakes. See page 8 for more details.
To bleed master cylinder and brakes, install bleeder hose on first wheel cylinder to be bled; if tandem axle trailer, bleed farthest axle
first, and the farthest brake on that axle first. Use a loose end of hose from the bleeder valve submerged in a clear container of
brake fluid to observe bubbling (hose must be submerged into clean brake fluid to keep air from traveling back into the brake cylinder).
Loosen the bleeder screw located in the wheel cylinder one turn; the system is now open to the atmosphere. The bleeding operation for
that brake is complete when bubbling stops. Be sure to tighten bleeder screw securely. Each wheel cylinder must be bled until all air
is out of the lines. Replenish the brake fluid during the bleeding process so the level does not fall below half full level in the master
cylinder reservoir. When bleeding and testing is completed, make sure master cylinder is filled to approximately 3/8” below the top of
the reservoir and filler cap is securely in place.