Trailer Brake Actuator for Hydraulic Brakes on a Tandem Axle Trailer

Question

Question:

Im shopping for new surge brakes. I have a tandem axle boat trailer with two, 3700 lb. axels. Both axles have brakes. Ive narrowed the brake assemblies down to part number AKFBBRK-35R-D and AKFBBRK-35L-D. Can you tell me if the Actuator, Number DM72VR is large enough to pressurize two axles? Thank you.

asked by: Case E

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Expert Reply:

The Demco Actuator # DM72VR is rated for trailers up to 7,000 pounds regardless of the number of axles. If your trailer is heavier use # DM8608601, rated for trailers up to 8,600 pounds.

The # AKFBBRK-35R-D and # AKFBBRK-35L-D brakes you've selected are for 3,500 pounds axles with a 4 bolt brake flange.

For a tandem axle brake line kit you can use # DM5428.

expert reply by: Charles S

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Answer 1

The Demco Hydraulic Trailer Brake Actuator for Drum Brakes #DM72VR has a brake line fitting on the rear of the master cylinder that will accept the standard 3/16 inch size brake line. The Dexter or Titan brand brake assemblies will work with this…

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Answer 2

The manual lockout on your Atwood 85778 surge brake coupler is there so that you can back up the trailer without the brakes locking up on you. Yes you can safely tow your trailer with the broken manual lockout, you just have to make sure you…

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Answer 3

Hey Richard, thanks for reaching out! The Dexter DX7.5 Drop-N-Go Brake Actuator #099-175-00 is a great option for a replacement actuator because it's a direct replacement for the common Model 60 actuators that were popular in the '90s.…

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Answer 4

The Demco Hydraulic Trailer Brake Actuator part #DM72VR should be a direct replacement for the Atwood 61101 Brake Actuator that you have now. This newest updated it rated at 7K instead of 6K. This is a bolt on option that mounts on 3" centers.…

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Answer 5

Your best route is to replace your entire surge brake assembly as Atwood no longer produces any parts for their brake actuators. The Titan Zinc-Plated Brake Actuator #T47457207K is going to be your best replacement available. It is specific to disc…

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Answer 6

The replacement I recommend for an Atwood Surge Brake Actuator 85778 is the Demco Hydraulic Brake Actuator part #DM62VR. It has the same ball size, offers a bolt-on install, and has a greater capacity. The only difference is it has an electric…

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Answer 7

I do have an option for you but the coupler on your trailer is very old and we simply don't carry parts for them anymore as they were discontinued by the manufacturer. Therefore, the only option we can offer is a new coupler, the Demco Hydraulic…

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Answer 8

Yes, if you inserted a rod into the hole that in front of the housing of the actuator of the part #DM72VR that would work as a manual lock out and allow you to reverse the trailer.

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