Recommended Drum Brake Actuator for a Trailer Coupler Wider Than 3 Inches
Updated 09/08/2025 | Published 06/04/2025
Products Featured in This Question
Question:
Good evening, I am looking at DM8759138. Along with almost all the other brake actuators. It says for a 3 channel. Mine actually measures 3 3\16 of an inch. Is this like a 2x4 where it doesnt actually measure 2 x4 ? If not, is there a product that you sell that will fit my application? Thanks
asked by: Robert J
Expert Reply:
That's a great comparison Bob but I am sorry, when they say the Demco Hydraulic Brake Actuator item # DM8759138 fits a 3" channel they mean it.
The closest alternative I have is the Demco Hydraulic Brake Actuator w/ Manual Lockout item # DM8759933. Capability and features wise, this is an identical actuator with the only acceptations being this one has to be welded on and it's primed not painted.
What kind of trailer do you have and what actuator are you currently using? You can add this information and any other questions you have in the box below that says Reply to Jerred H.
(click to enlarge)
Product Page this Question was Asked From
Demco Hydraulic Brake Actuator - Drum - Black - 8" Adjustable Channel Down - 8,000 lbs
- Brake Actuator
- Surge Brake Actuator
- Farm Trailer
- Construction Trailer
- Bolt-On
- 8000 lbs GTW
- Channel
- 3 Inch Channel Tongue
- Drum Brakes
- No Lockout
- Demco
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Q&A: Is the Demco Actuator # 8759121 a Center Adjustable Actuator
- Q&A: Brakes Still Lock Up with Manual Reverse Lockout Kit for Demco Hydraulic Trailer Brake Actuators
- Q&A: Is There a 4-Way Wiring Harness for a 2026 Chevy Equinox Activ?
- Q&A: Bearings and Grease Seal for Terran Axle Idler Hub
- Q&A: How To Wire Brake Buddy Battery Charger 39339
- Q&A: Installation of the Brake Buddy Classic 3, How to Provide Power
- Q&A: Instructions to Wire a Trailer for Electric Brakes
- Article: How to Bleed Your Trailer Surge Brakes
- Article: Adding Electric Over Hydraulic Disc Brakes
- Article: How Level Should a Tow Bar Be When Flat Towing
- Article: Parts Needed to Add Hydraulic Disc Brakes to a Trailer
- Article: Is It Illegal to Leave My Hitch on My Truck?
- Article: Trailer Drum Brakes vs. Disc Brakes: Making the Decision
- Article: RV Propane 101: How Does My RV's Propane System Work?
Jerred H.
9/8/2025
Hey Bob, did you find a brake actuator that fits your trailer? I'm asking because it could help others in a similar situation.