Do You Have a Rebuild Kit for My Surge Brake Actuator Atwood 85739? What Replacement do I Need?
Updated 09/02/2025 | Published 08/15/2025
Products Featured in This Question
Question:
Looking for master cylinder rebuild kit for atwood cylinder with 1 inch bore. atwood number on master is atwood85739 thank yoi
asked by: Matt S
Expert Reply:
Hello Matt,
I have a replacement for you, but I am sorry to inform you that Atwood went out of business quite some time ago so there is no longer replacement parts for the Atwood 85739.
Instead you will want to swap out your Atwood 85739 for one of the following:
For Weld on:
- Disc Brakes: Dexter DX7.5L A-60 Brake Actuator # DX79FR
- Drum Brakes: Dexter DX7.5L A-60 Brake Actuator # DEX94FR
For Bolt on:
- Disc Brakes: Dexter DX7.5L A-60 Brake Actuator # DX56FR
- Drum Brakes: Dexter DX7.5L A-60 Brake Actuator # DX27FR
I am sorry we do not have a rebuild kit for what you do have, in my experience it is easier to swap one out than to try to rebuild one. But I am also all about fixing what I have instead of buying new, so I see why you were looking for the right kit.
What kind of trailer is this going on, boat trailer?
(click to enlarge)
Product Page this Question was Asked From
Demco Actuator Replacement Master Cylinder for Drum Brakes
- Accessories and Parts
- Brake Actuator
- Hydraulic Drum Brakes
- Master Cylinder
- Demco
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Search Results: bearing l44649 and l68149 trailer bearings races seals caps
- Search Results: wheel bearings
- Search Results: 7 way upgrade kit
- Shop: Demco DA75 Trailer Brake Actuator for Drum Brakes - Zinc Plated - 2" Ball - 7,500 lbs
- Search Results: 4 way to 7 way connector
- Search Results: 7 way connector
- Search Results: electric brake breakaway switch
- Search Results: trailer wiring
- Shop: Dexter DX7.5L A-60 Brake Actuator - Weld On - Drum - 2" Ball - Primed - 7,500 lbs
- Shop: Replacement Consumer Lockout Key for Dexter Axle Brake Actuators - Qty 1
- Shop: Brake Actuator with Electric Lockout - Bolt On - Disc - 2" Ball - 7,500 lbs
- Shop: Demco Actuator Replacement Master Cylinder for Drum Brakes
- Video: Review of Demco Brake Actuator - DA75 Trailer Drum Brake Actuator - DM28CV
- Video: Review of Dexter Brake Actuator - Surge Brake Actuator - DEX94FR
- Shop: Dexter Electric Trailer Brakes - 10" - Left/Right Hand Assemblies - 3,000 lbs
- Shop: Dexter Electric Trailer Brakes - 10" - Left/Right Hand Assemblies - 3.5K
- Video: Hands-On with the Replacement Consumer Lockout Key for Dexter Axle Brake Actuators
- Video: Dexter Brake Actuator Review
- Video: Review of Demco Brake Actuator - Surge Brake Actuator - DM8609502
- Q&A: First Step for Troubleshooting Trailer Surge Brakes that Aren't Working
- Q&A: Recommended Disc Brake Hubs, Lines, and Hydraulic Actuator for a Boat Trailer w/a 3,500 lbs Axle
- Q&A: Troubleshooting Trailer Brakes Locking Up When Driving Forward
- Video: Demco Hydraulic Brake Actuator: The Breakdown
- Video: Review of Demco Brake Actuator - Surge Disc Brake Actuator - DM68CV
- Q&A: Can Electric Brakes be Used on a Boat Trailer
- Q&A: Replacement for Demco Master Cylinder 05680-C for Drum Brakes
- Q&A: Replacement Inner Parts for Demco 12.5K Weld-On Actuator
- Q&A: Recommended Replacement Coupler for an Atwood 171
- Article: Trailer Brakes Not Working? Troubleshooting Guide
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
on Accessories and Parts
Kate F.
9/2/2025
Hey Matt, Did you decide to swap out your Atwood master cylinder with one of the Dexter brake actuators I suggested? I'm asking because your experience could help others who are facing the same situation.