What is Master Cylinder of Demco Trailer Brake Actuator # DM72VR Constructed Of

Question

Question:

Hi, is the brake fluid reservoir on this made from a non-corroding material? Thanks

asked by: Geno

1

Helpful Expert Reply:

The master cylinder (reservoir that holds the brake fluid) used in the Demco Trailer Brake Actuator # DM72VR is constructed of a fiberglass reinforced nylon composite that will not corrode, which makes this actuator perfect for marine applications.

expert reply by: Mike L

1

Answer 1

The Atwood 85778 actuator has been discontinued so I recommend the Dexter DX7.5L A-60 Brake Actuator - Bolt On - Drum - 2" Ball - Zinc - 7,500 lbs #DX33FR. If you need a higher capacity, then you will need to use a 2-5/16 inch hitch ball.…

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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

Surge brakes do not have any adjustability. If you want to use them on steep hills your solutions would be best. Or you can look into an electric over hydraulic setup which will allow you to use a brake controller to activate the brakes. This gives…

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Answer 4

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 5

The Atwood master cylinder 85841 is no longer available. Atwood doesn't product any actuator components anymore so it's getting harder and harder to track down replacement parts. We do not have any other replacement units that would be…

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Answer 6

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 7

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 8

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

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Answer 9

Traditionally, trailer manufacturers did not use electric brakes on boat trailers because the brake magnet wiring and trailer wiring did not always have the best insulation or water protection. These days, more and more manufacturers are using…

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Answer 10

Thank you for the pictures! For a replacement option I recommend the Dexter DX7.5L A-60 Brake Actuator w Electric Lockout - Bolt On - Disc - 2" Ball - Zinc - 7.5K #DX29FR to replace your current actuator. The #DX29FR has a 7500lb trailer weight…

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Answer 11

There really isn't a particular maximum trailer weight that is used to determine when brakes need to be added to both axles of a tandem axle setup. While I do still recommend checking your local laws, I am also not aware of any general laws that…

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Answer 12

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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