Tie Down 70LP - Manual

Installation Instructions and Service Manual
Model 70LP
(Low Profile)
Actuator* for
Trailer Brakes
7000 lbs Capacity
Part #47225/47226 - Drum Brake Ready
Part #47228/47227- Disc Brake Ready
* US Patent No. 6,375,211
MODEL 70LP ACTUATOR INSTALLATION INSTRUCTIONS
IMPORTANT: READ AND UNDERSTAND THE ENTIRE INSTRUCTION/ASSEMBLY PROCEDURE BEFORE INSTALLING YOUR
BRAKES AND ACTUATOR.
The Model 70LP works by the “surge” or “push” of the trailer toward the tow vehicle. 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 the 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 by depending on the brake fluid in the master cylinder. Low levels of brake fluid will signal the tow vehicle operator to add
brake fluid via hitch ball knocking.
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 70LP Actuator is completely assembled and ready to weld into place.
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. Tie Down’s actuators feature a shock dampener that uses brake fluid from the master cylinder. The dampener must be primed before
bleeding or using trailer. To prime the dampener, fill the master cylinder with DOT 3 brake Fluid. Push the coupler into the housing and
slowly pull out 3 times, then refill master cylinder.
3. Use only DOT-3 heavy-duty hydraulic fluid in the Model 70LP 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.
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 glass 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.
4. Check with your state motor vehicle department for laws concerning minimum trailer brake requirements. Some states may require
brakes on all axles.
030708,C462
Instruction #15397