Model 850E Brake Actuator Owners Manual
Installation Instructions and Service Manual Model 850E - 8,500 lbs. Capacity Part #70523 Disc Brake Part #70524 Drum Brake Model 850 - 8,500 lbs. Capacity Part #70503 Disc Brake Part #70504 Drum Brake Model 800 - 8,000 lbs.
IMPORTANT: READ AND UNDERSTAND THE ENTIRE INSTRUCTION/ASSEMBLY PROCEDURE BEFORE INSTALLING YOUR BRAKES AND ACTUATOR. The Model 850E 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.
. Check with your state motor vehicle department for laws concerning minimum trailer brake requirements. Some states may require brakes on all axles. 5. Road test trailer a short distance to activate the actuator several times. Check fluid level again. Remember, low brake fluid levels will result in hitch ball knocking. 6. 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.
8. Equalizing or weight distributing hitches may be used, that are designed to use with surge brake actuators, allow six to eight inches free chain length. DANGER: Tongue weight beyond rating limits will interfere with performance of actuator, and braking system, and the tow vehicle. 9. The actuator is designed for use with Free-Backing trailer brakes. To block braking action, (in order to back up) with other types of brakes, use an electric solenoid.
Braking and Trailering Warnings WARNING Actuator and brakes should always be flushed with fresh water after using trailer in corrosive conditions. This includes salt water, fertilizers and other corrosive materials. Before storing trailer remove brakes and clean thoroughly. It is also wise to repack the bearings at the same time. Failure to properly and adequately maintain the actuator could cause serious damage, injury or death.
WARNING A minimum of 5% tongue weight and a maximum 10% tongue weight of the trailer G.V.W.R. must be located on the hitch ball. The Trailer tongue should be parallel to the ground. Too much weight can cause premature brake actuation and loss of control of the towing vehicle. To little tongue weight can cause the trailer to fishtail, resulting in loss of control of the tow vehicle and trailer (total trailer weight G.V.W.R. includes weight of the trailer plus load).
Bleeding Instructions To bleed master cylinder and brakes, install bleeder hose 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).
FRONT FRONT Push the screwdriver forward and back to pump the master cylinder. (See 2B). 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.
Model 850E/850/800 Replacement Parts 1A & 6 5 3 1A 7 5 5 4 1A 1A 2 Page 9
Model 850E/850/800 Replacement Parts 1C 1B 1B 1A 1A Model 850E “Enclosed” Master Cylinder Item # Part # 1A 70475K 1A 70475KD 1A 70561K 1A 70562KD 1B 11286 1C 70470-3 2 70411 2 70412 3 50317 4 50301 5 70462K 6 48986A 6 70470-4 7 48845 Model 800 & 850 “Open” Master Cylinder Description Disc Brake Master Cylinder Kit “Open Model” with gasket, Includes: master cylinder and cap, 4 mounting screws with washers, 2 rollers with matching nuts and bolts Drum Brake Master
Model 80 Replacement Parts Model 80 - 8,000 lbs.
Model 80 Replacement Parts 1C 1B Model 80 “Open” Master Cylinder Item # Part # 1A 47260K 1A 47268K 1B 11253A 1C 48803 2 47261 2 47262 3 50302 3 50305 4 50301 5 47264 6 48804 7 48845 1A Description Disc Brake Master Cylinder Kit “Lever Latch” with gasket and fluid baffle, includes: master cylinder and cap, 4 mounting screws with washers, 2 rollers with matching nuts and bolts Drum Brake Master Cylinder Kit “Lever Latch” with gasket and fluid baffle, includes: maste
TIE DOWN ENGINEERING LIMITED WARRANTY Limited Warranty TIE DOWN ENGINEERING (“TIE DOWN”) warrants its products to be free from defects in material and workmanship for one year from date of delivery to the original purchaser when properly installed, used and maintained by the purchaser. This warranty does not apply to damage or loss caused by any or all of the following circumstances or conditions: • Damage caused during installation.
To Obtain Technical Assistance: To enable TIE DOWN to respond to a request for assistance or evaluation of customer or user operating difficulty, please provide at a minimum the following information by calling 1-800-241-1806: • Model number, serial number and all other data on the specific component which appears to be involved in the difficulty. • The date and from whom you purchased your TIE DOWN product.
TIE DOWN ENGINEERING 255 Villanova Drive SW, Atlanta, GA 30336 (404) 344-0000 • Fax (404) 349-0401 © 2014 TIE DOWN, Inc.
