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Review of Dexter Axle Brake Actuator - Surge Brake Actuator - DX43FR

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Dexter Axle Brake Actuator - Surge Brake Actuator - DX43FR Review


Jeff: Hello everybody, this is Jeff at etrailer.com. Today, we're going to take a look at this Dexter DX7.5L weld-on disc brake actuator, with the electric lockout for two inch hitch ball, and has a 7,500 pound weight capacity. Now you'll use this actuator to synchronize your trailer brakes with your tow vehicle brakes. This hydraulic actuator will activate the trailer brakes when the tow vehicles slow or stop.Basically, what happens, is when you apply the brakes in your tow vehicle, deceleration occurs, and the momentum will push your trailer toward the rear vehicle. With the surge brake system, this actuator is then triggered as your trailer moves forward While the tow vehicle slows. The inside portion right here of the actuator will telescope in, apply force to the master cylinder back here, which in turn supplies the necessary hydraulic pressure to engage your trailer's brakes.If you notice on the front here, has a nice low profile coupler latch to ensure easy secure connection, and it prevents any damage.

On some actuators, you'll see a tall latch that hooks it up to the hitch ball, and it sits up high, and it can get hit or damage and vent. This one is nice flush, low profile design, and it uses an over-center latch mechanism, which only engage when the actuator's fully seated on a two inch hitch ball.Now I did pull a two inch hitch ball. I wanted to show you how this attaches. Here's your two inch hitch ball. Basically, what you'll first do to attach it: just slide out this tethered safety pin, and that'll allow the latch to fully open.

Then this little round portion up the top, here: it's spring loaded. You just push that all the way over, and it'll unlatch it. Now you're ready to install.All you got to do is go over your two inch hitch ball. Once you're over, lock our drop right into place, and then push this down, and it locks it onto the ball. Then, for extra safety, you take the safety pin, slide it all the way through.

That'll prevent that latch from opening. Now, if by chance you bump something, or something hits this, it won't let the latch fully open; it'll still stay connected to the ball. You just push it back down, and then to fully remove it, just slide that safety pin back out, fully open your latch, and detach it from the hitch ball. Simple as that. It's a very easy connection and disconnection.

Put that back down, we'll take our safety pin, slide it all the way over.Also, if you notice on here, this cable, it includes this breakaway cable. Now, a breakaway cable is required by law, because this will prevent a trailer runaway situation. If by chance, this come detached from your tow vehicle and the trailer was in a runaway situation, this cable would activate the brakes. This hook right here attaches to your tow vehicle at all times. If that come detached, it would pull on this cable, which would activate the master cylinder to apply the brakes. That is required by law, comes all included.Now this one, let me flip it over, and I want to show you the back of the master cylinder, right back here. If you'll see these wires, there's an actual electric reverse lockout solenoid. This'll let you back up without actuating your trailer brakes. The electric reverse lockout is automatically activated when you shift your tow vehicle in reverse. Those wires there will get wired into your trailer connector, which connects to your tow vehicle, so that it'll detect when you go into reverse. When you put the vehicle in reverse, that solenoid will ensure that the hydraulic actuator does not actuate your trailer brakes, thus, allowing you to back up the vehicle. Now to use the lockout feature, you do have to have either a 5-Way Flat, 6-Way Round, or 7-Way Trailer Connector on your tow vehicle.The master cylinder right here, you can see that the solenoid's attached to, it is constructed of aluminum rather than plastic or steel, gives you increased strength and corrosion resistance. You access that master cylinder right up at the top, here. You'll see it has this recessed brake fluid filler cap, right up here, to access your brake fluid, to fill it up, or to check the level. You'll notice that it is a nice prime finish. It is a weld-on installation. It is designed to fit three inch by three inch, or three inch by four inch straight tongue trailers. This part is made in the USA. Again, it's for hydraulic disc brakes. The hitch ball size it fits is a two inch diameter, and the weight capacity on it is 7,500 pounds. That should do it for the review on the Dexter DX7.5L weld-on disc brake actuator, with the electric lockout, for a two inch hitch ball, and has a 7,500 pound weight capacity..


Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Leah B
Edited By:
Leah B

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