Tie Down 80LP - Manual

TIE DOWN ENGINEERING • 255 Villanova Drive SW • Atlanta, GA 30336
www.tiedown.com (404) 344-0000 Fax (404) 349-0401
Installation Instructions and Service Manual
Model 80LP
(Bullet)
Actuator* for
Trailer Brakes
8000 lbs Capacity
Part #48970- Disc Brake Ready
* US Patent No. 6,375,211
MODEL 80LP ACTUATOR INSTALLATION INSTRUCTIONS
IMPORTANT: READ AND UNDERSTAND THE ENTIRE INSTRUCTION PROCEDURE BEFORE USING YOUR BRAKES
AND ACTUATOR.
The Model 8 0LP works by the “surge” or “push” of the trailer toward the tow vehicle when braking. This automatically synchronizes the
trailer brakes with the tow vehicle axle brakes. When the trailer pushes against the tow vehicle, the actuator telescopes together and applies
force to the master cylinder, supplying hydraulic pressure to the brakes. The built in dampening shock absorber retards the telescoping
shock against the hitch ball.
Brake laws sometimes are minimum standards and you may wish to add additional brakes to your trailer. Read your tow vehicles
owner’s manual on towing capacity and other towing recommendations before installing brakes or this actuator.
The Model 80LP Actuator is completely assembled and ready to install.
1. Hydraulic brake lines should be installed on the trailer as described in the installation manual supplied with the brakes. Note: Some
disc brakes require the use of flexible brake lines at the connection POINT on the brake caliper. Follow brake manufacturer instructions.
2. Use only DOT-3 heavy-duty hydraulic fluid in the Model 80LP actuator. Use a pressure type brake bleeder to bleed brakes. (This type
of brake bleeder is available at your local automotive jobber.) Follow manufacturer’s directions. Or, manually bleed the brakes using a
heavy-duty flat blade screwdriver inserted in the hole provided on 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.
NOTE: Your trailer may come with a single point bleed system, please read the owners manual before bleeding brakes
To bleed master cylinder and brakes, the bleeder hose must be attached to the highest (top) valve on the caliper, on first wheel
cylinder to be bled; if tandem axle trailer, bleed closest axle first, and the closest brake on that axle first. Use a loose end of hose
from the bleeder valve submerged in a clear plastic 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 bleed 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 3/8” below the top of the reservoir and filler cap is securely in place.
3. Check with your state motor vehicle department for laws concerning minimum trailer brake requirements. Some states may require
brakes on all axles.
4. When testing is completed, make sure master cylinder is filled to 3/8” below the top of the reservoir and filler cap is securely in place.
Road test again to make sure brakes work properly.
5. Road test trailer a short distance to activate the actuator several times.
031714,B1032
Instruction #08172