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: 7 way upgrade kit
- Search Results: wheel bearings
- Search Results: 7 way connector
- Search Results: electric brake breakaway switch
- Search Results: 4 way to 7 way connector
- Search Results: trailer wiring
- Shop: Brake Actuator with Electric Lockout - Bolt On - Disc - 2" Ball - 7,500 lbs
- Shop: Demco Actuator Replacement Master Cylinder for Drum Brakes
- Shop: Dexter DX7.5L A-60XL Surge Brake Actuator - Drum - 2" Ball - Zinc - 7.5K
- Shop: Dexter Surge Brake Actuator - Disc - Elec Lockout - 2" Ball - Zinc - 7.5K - 3" x 5"
- Shop: etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector
- Shop: Hub Bearing Kit for Lippert, Dexter, and AL-KO Axles - 3,500 lb with #84 Spindle
- Shop: Dexter Electric Trailer Brakes - 10" - Left/Right Hand Assemblies - 3.5K
- Q&A: Recommended Disc Brake Hubs, Lines, and Hydraulic Actuator for a Boat Trailer w/a 3,500 lbs Axle
- Q&A: Replacement for Dexter A-60 Brake Actuator
- Q&A: Troubleshooting Trailer Brakes Locking Up When Driving Forward
- Video: Review of Demco Brake Actuator - Surge Disc Brake Actuator - DM68CV
- Video: Review of Demco Brake Actuator - DA75 Trailer Drum Brake Actuator - DM28CV
- Q&A: Can Electric Brakes be Used on a Boat Trailer
- Video: Demco Hydraulic Brake Actuator: The Breakdown
- Video: In-Depth Review of the Replacement Shock for Demco Hydraulic Trailer Brake Actuators
- Video: Complete Breakdown of the Kodiak Disc Brake Kit-K2R35S
- Video: Hydrastar Brake Actuator HBA-CAM Review
- Video: HydraStar Electric Over Hydraulic Disc Brake Actuator Installation
- Q&A: Replacement Inner Parts for Demco 12.5K Weld-On Actuator
- Q&A: Recommended Replacement Coupler for an Atwood 171
- Q&A: Replacement for Demco Master Cylinder 05680-C for Drum Brakes
- Article: Trailer Brakes Not Working? Troubleshooting Guide
- Article: How to Bleed Your Trailer Surge Brakes
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.