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Demco Brake Actuator - Surge Brake Actuator - DM8509612 Review

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Review of Demco Brake Actuator DM8509612


Today we're going to take a look at the Demco A-Frame Hydraulic Brake Actuator with the 4 inch drop. This is for drum brakes and has a 7,000 pound weight capacity. This hydraulic actuator will activate your trailer's brakes when the tow vehicle slows or stops. Has the Bulldog Collar-Lok design on this one. It fits tightly around the hitch ball for secure connection. It is a heavy duty design actuator.

It's great for utility, livestock, cargo, and construction trailers. Has a pin style fastener which will hold the collar in place around the base of the hinge ball socket. The master cylinder, if I can rotate this, you can see on the back here, there's a master cylinder. It's a composite master cylinder which is very durable and efficient. It is glass reinforced nylon construction, so it does resist rust and corrosion. It's very large reservoir so it provides increased capacity for brake fluid.

Very top here, you can see as I unscrew it, it's an automotive style diaphragm cap. This is designed to completely enclose the system to help prevent contamination of the fluid. Now I want to rotate it again. We can look at the, right where this goes in and out on the actuator, right in here. They use an acetone co-polymer lining and this will provide a nice, smooth operation as the actuator telescopes in and out. As you can see, it has a built-in, 4 inch drop.

This will help you match your tow vehicle height. The break away, right here you can see, this is all included. This actuator is a heavy duty steal construction. Has a nice prime finish to it. It is a weld-on installation. This part is made in the USA.

Again, the application for this is a 50 degree A-Frame trailer with hydraulic drum brakes. The ball size this fits on is a 2 inch diameter. Gross towing weight capacity is 7,000 pounds. Maximum ton weight capacity is 1,050 pounds. Again, the drop is 4 inches, and this also goes by the common industry standard model number of DA91. One note on this, I do want to let you know, is because this actuator does not include a reverse lock out, it is recommended that you equip your trailer with free backing brakes so that you can drive in reverse without this actuator triggering your trailer's brakes. That should do it for the review on the Demco A-Frame Hydraulic Brake Actuator with the 4 inch drop designed for drum brakes and a 7,000 pound weight capacity.


Info for this part was:

Employee Jeff D
Installed by:
Jeff D

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