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DEMCO MODEL DA20 BRAKE ACTUATOR
INSTALLATION
Model DA20 is completely assembled and ready to bolt or weld into place.
1. DA20 actuators have a variety of mounting channels available. (see Page 15)
2. Connect and tighten all brake lines.
3. Fill master cylinder (#18) with DOT 3 or 4 brake fluid.
4. Bleed brake system using a pressure-type brake bleeder or manually, as follows:
a. Remove two 5/16" hex head bolts (#13) and lock washers (#12) that hold lever guide
(#23) and flat emergency lever spring (#11). Remove lever guide and emergency lever spring.
Using short strokes, pull forward on emergency lever (#16), pumping master cylinder until
brake fluid within master cylinder stops bubbling.
b. Attach a bleeder hose to bleeder valve on one of the wheels and submerge other end of hose
into a transparent container partially filled with brake fluid. Loosen bleeder valve one turn
and, watching hose in transparent container, use emergency lever to pump master cylinder
as long as air bubbles continue to leave the hose. When bubbles stop, close bleeder valve,
move to next wheel, and repeat process until all brakes have been bled. (Note: Check fluid level
in master cylinder frequently while bleeding brakes (every 4 or 5 strokes). Refill as necessary
to keep level above half full.)
• Review all of the following instructions before installation and use of hydraulic brake
actuator.
• Dealers or Distributors must review these instructions with ultimate user.
• Failure to follow these instructions, or failure to properly maintain braking system after
installation, can result in loss of braking action which could cause severe property damage,
personal injury or death.
To Prevent Serious Injury Or Death:
WARNING
WARNING
Model DA20 brake actuator has a maximum load rating of 20,000 lbs.
GVWR and 2,000 lbs. tongue load.
To avoid personal injury or death, do not exceed lowest of (1) the rated
capacity of Model DA20 actuator, or (2) rated capacity of ball, hitch, and
coupler being used, or (3) trailer's Gross Vehicle Weight Rating (GVWR).
Model DA20 brake actuator has a maximum tongue load equal to 10%
of the maximum load rating.
