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
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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
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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.