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Demco Brake Actuator - Surge Brake Actuator - DM8759131 Review

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Review of Demco Brake Actuator DM8759131

Today we're going to take a look at the Demco hydraulic drum brake actuator with the eight inch adjustable channel down position. It has an 8,000 pound weight capacity. This hydraulic actuator will activate your trailer brakes when your tow vehicle slows or stops. The adjustable channel right here the in the front will have three different mounting positions for the coupler that you attach. It is in the channel down position, which allows for a greater drop. Now, this does have a zinc plating, which will offer excellent corrosion resistance.

It goes through a 500 hour salt spray rating. It's great for marine applications. On the very back here, let me rotate this so you can see, right here underneath is the composite master cylinder, which is very durable and efficient. It's made of a glass reinforced nylon construction; it resists rust and corrosion. It has a large reservoir to help provide increased capacity for the brake fluid, and it uses up here on the top, an automotive style diaphragm cap, which will create a completely enclosed system to help prevent any contamination of the brake fluid.

On the inside of this, they do use an acetone copolymer lining to provide smooth operation, as this actuator will telescope in and out. The breakaway, right up here at the top you can see, is included. If you notice on the end here, they do use a snap hook on the safety cable, and that's to ensure a secure connection to the breakaway lever. It's made of a heavy duty steel construction with a sturdy reinforced outer casing. This is a bolt-on installation, you can see right down here at the bottom. Now it does require to use half inch by four and half inch grade five bolts for mounting this, and they are not included.

We do sell those separately. This part is made in the U.S.A. A few specs on this, the application is this is for trailers with hydraulic drum brakes, the gross towing weight capacity is 8,000 pounds, maximum tongue weight is 800 pounds. Now the channel width, let's turn this a little bit, the width of the channel inside dimension is going to be right at three inches. The channel height, which will be from the very bottom to the very top, is going to be right at eight inches.

This actuator is designed for mounting on a straight three inch wide trailer tongue, and the model number on this is DA91. One last note I want to mention on this actuator is because this actuator does not include a reverse lockout. It is recommended that you equip your trailer with free backing brakes, so that you can drive in reverse without the actuator triggering your trailer brakes. That should do it for the review on the Demco hydraulic drum brake actuator with the eight inch adjustable channel down position and an 8,000 pound weight capacity.

Info for this part was:

Employee Jeff D
Installed by:
Jeff D

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