How to Bleed Brakes with Demco Hydraulic Brake Actuator

Question

Question:

How do you go about bleeding the brakes on this actuator ?

asked by: Patrick M

0

Expert Reply:

I have attached an image from the operation manual for the Demco Hydraulic Brake Actuator # DM8669112 that details how to bleed the brakes.

The process consists of first elevating the trailer tongue about 4 to 6 inches and then loosening or removing the two 5/16" bolts that hold the lever guide and emergency lever spring and removing the master cylinder fill cap. You will want to use short strokes to pull the emergency lever forward, pumping the master cylinder until the brake fluid in the reservoir stops bubbling. Then attach a bleeder hose to a bleeder valve on one of the wheels (starting at the wheel furthest from the master cylinder) and submerge the other end into a clear container that's partially filled with brake fluid.

Loosen the bleeder valve one turn and while you're watching the fluid in the container, use the emergency lever to pump fluid for as long as bubbles continue to leave the submerged hose. When the bubbles stop you can close the bleeder valve and move onto the next wheel.

I have attached a video demonstration on this process that you might also find helpful.

expert reply by: Chris R

0

click to enlarge

Answer 1

I have attached a video for you to help you bleed the surge brakes and also given an explanation below. You want to top off the master cylinder and pump the fluid from the master cylinder. You can do this by unbolting the plate that holds the lever…

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Answer 2

Yes, you can tow the Demco Kar Kaddy SS Tow Dolly #DM9713045 empty if ever needed and it would work fine on a 5 hour trip. You do need to keep the tire pressure down to 20 psi.

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Answer 3

The two wheel cylinders you mentioned #T0977600 and #T0977600 are mirrored versions of each other. The part #T0977700 fits the left hand side and the #T0977600 fits the right hand side. They are not interchangeable.

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Answer 4

The replacement wheel cylinder that will work with your Dexter #23-342 left hand brake assembly is part #AKBRKR-H7-L-CR. If you need a replacement wheel cylinder for the right hand side you need part #AKBRKR-H7-R-CR.

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Answer 5

Since the Atwood 85736 has been discontinued for quite some time, we as a result, do not carry it's replacement parts, however I do have another alternative. I know it's not ideal, but since it's going to become harder and harder to find…

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Answer 6

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 7

Yes, we do have the Demco Hydraulic Brake Actuator #DM72VR. The Demco #DM72VR is a surge brake actuator for drum brakes that is rated for 7,000 lbs and accepts a 2" hitch ball.

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Answer 8

While the install instructions link for the #DM5939 does seem to be not working I was able to find a diagram that shows how this installs on a coupler for you to check out that shows how it installs and where.

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Answer 9

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 10

If you can route the brake lines of the part #HS496-252 on the inside of your trailer frame that's what I would recommend since it will give the lines the most protection as possible. Otherwise running them on the outside is fine too, but just…

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Answer 11

When looking for a replacement brake line kit, you will want to measure from the port on the back of the actuator to the T-Fitting where the lines split off and go to the separate brakes, which is typically right at the axle. There will be a short…

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Answer 12

The Kar Kaddy SS, part #DM9713045, does not have a lock out on the hydraulic brakes to keep them from engaging while in reverse. With that being said in most cases you won't need one because the dolly is only 615 pounds unloaded which won't…

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How to Bleed Brakes with Demco Hydraulic Brake Actuator

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