Do I Need To Bleed The Brakes After Installing Demco DM28CV Brake Actuator On Trailer?

Updated 08/15/2025 | Published 07/21/2025

Question:

can I install this myself without bleeding the brakes? I've never had to do that and don't want to take it to a shop and pay money. thanks for advice.

asked by: Derek

Expert Reply:

Derek, you’ll definitely need to bleed the brakes after installing the Demco Drum Brake Actuator # DM28CV. Anytime you swap actuators or open the hydraulic line, air can enter the system and reduce braking performance. We recommend a good two-person bleed or a vacuum bleeder for best results. Use DOT 3 or DOT 4 fluids.

I've attached a help article and video that covers brake bleeding. It's easy if you have a helper that can engage the brakes manually while you work the hydraulic valve open and closed at all of the valve locations.

expert reply by: Andrew N

Andrew N.

8/15/2025

Hey Derek, did you get a chance to try bleeding the brakes after installing the Demco Brake Actuator? I'm curious to know how it went for you, as it could really help others who are thinking about doing the same job themselves.