How To Bleed The Brakes With A Demco Hydraulic Brake Actuator DA91

Updated 06/09/2023 | Published 06/08/2023

Question:

How to bleed the brakes on this model?

asked by: Vince P

Helpful Expert Reply:

To bleed the brake lines with your Demco Hydraulic Brake Actuator w/ Drop and Electric Lockout # DM8750311 you'll need to complete the following steps:

1. First raise the tongue of the trailer 4" to 6".

2. Loosen or remove two 5/16” bolts that hold the lever guide and flat emergency lever spring.

3. Remove the master cylinder fill cap.

4. Using short strokes, pull forward on emergency lever, pumping master cylinder until brake fluid in master
cylinder reservoir stops bubbling.

5. Attach a bleeder hose to a bleeder valve on one of the wheels (starting at wheel farthest from master cylinder )
and submerge other end into a transparent container partially filled with brake fluid to prevent possible splashing from container.

6. Loosen bleeder valve one turn and while watching fluid in container, use emergency lever to pump fluid
as long as bubbles continue to leave submerged hose. When bubbles stop, close bleeder valve, move to next
wheel and repeat until all brakes are bled. (Note: Check master cylinder often (every 4-5 strokes) and refill
above half full as needed.

7. Refill master cylinder and securely attach cap. Reinstall emergency lever spring, lever guide, lock washers and 5/16” hex head bolts. When tightening the bolts, make sure the lever moves freely in the groove in the
guide.

I've attached one of our help articles below that goes over bleeding the brakes and offers some additional tips to make this an easier process.