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  1. Brake Actuator
  2. Dexter
  3. Surge Brake Actuator
  4. Drum Brakes
  5. Channel
  6. 20000 lbs GTW
Dexter Hydraulic Brake Actuator - Drum - Primed - 5 Position Adjustable Channel - 20,000 lbs
Dexter

Dexter Hydraulic Brake Actuator - Drum - Primed - 5 Position Adjustable Channel - 20,000 lbs

Part Number: T4856920
In Stock
$843.34
Brake Actuator
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Surge brake actuator with adjustable drop channel lets you mount a coupler in 1 of 5 positions to fit your application. Electric lockout lets you back up without activating trailer brakes. Roller design reduces resistance. Made in the USA. 1-800-940-8924 to order Dexter brake actuator part number T4856920 or order online at etrailer.com. Free expert support on all Dexter products. Great prices and Fastest Shipping for Dexter Hydraulic Brake Actuator - Drum - Primed - 5 Position Adjustable Channel - 20,000 lbs. Brake Actuator reviews from real customers.
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Dexter Brake Actuator - T4856920

Highlights

  • Back Up Without Brake Drag: Electric lockout lets you reverse without activating trailer brakes.
  • Level Towing for Tall Trailers: 5-position adjustable channel aligns coupler height for a level setup.
  • Handles Heavy Loads: Rated for 20,000 lbs GTW and 2,000 lbs tongue weight for large drum-brake trailers.
  • Smooth Straight-Line Braking: Roller design reduces resistance for consistent surge brake action.
  • Built to Last: Sturdy steel body with primed outer case and painted inner slide resists bending.
  • Secure in Emergencies: Includes breakaway chain to engage brakes if the trailer disconnects.
Made in USA

Features to know about

Smooth Stops Every Time: Surge Hydraulic Power for Drum Brakes

This actuator uses a surge hydraulic system that automatically applies your trailer’s brakes when the tow vehicle slows down. With a 20,000-lb gross towing weight and 2,000-lb maximum tongue weight rating, it’s built to deliver steady and dependable braking for heavy trailers. The sturdy steel construction stands up to hard use and resists bending even in tight jackknife situations, keeping braking smooth and consistent on every trip.

No More Brake Dragging in Reverse: Built-In Electric Lockout

Backing up a loaded trailer is a lot easier with the integrated electric reverse lockout. When you shift into reverse, the solenoid automatically prevents the actuator from engaging the brakes so you can maneuver without resistance. The solenoid wires into a 5-pole flat, 6-way round, or 7-pole trailer connector and includes a built-in shield that protects it from the elements for long-term reliability.

Level Towing Made Simple: 5-Position Adjustable Channel

The offset adjustable channel gives you five different mounting positions so you can set your coupler where it needs to be. The built-in drop design is especially handy for tall trailers, letting the coupler sit lower for a level towing setup. It works with standard ball couplers, lunette rings, or clevis attachments (sold separately), giving you flexibility for just about any trailer configuration.

Durable Build: Primed and Ready for Welding

This actuator comes primed on the outer casing with a painted inner slide, making it ready to weld directly onto a 3" straight trailer tongue. The primed finish protects against corrosion before painting, so you can match it to your trailer once installed. A breakaway chain is included for added safety in the event of an emergency disconnect.

Low-Friction Design: Roller System for Straight-Line Movement

The unique roller design reduces internal resistance during telescoping so the actuator glides in a straight line instead of binding under pressure. That means smoother brake application and less wear over time, keeping your braking system operating cleanly and reliably trip after trip.

Specs

Application

  • Application: trailers with hydraulic drum brakes

Weight and Capacity

  • Gross towing weight: 20,000 lbs
  • Maximum tongue weight: 2,000 lbs

Mounting

  • Mounting: straight, 3" wide trailer tongue

Warranty

  • Warranty: 1-Year warranty

068-387-01 Dexter Axle Model 20 Brake Actuator w/ Electric Lockout and 5-Position Leveler Channel - Drum - Weld On - 20,000 lbs

Replaces Titan 4856900





Video of Dexter Hydraulic Brake Actuator - Drum - Primed - 5 Position Adjustable Channel - 20,000 lbs
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for An In-Depth Look at the Dexter Hydraulic Brake Actuator

Today we are going to take a look at the Titan adjustable channel, hydraulic drum brake actuator with the reverse lockout and a 20,000 pound gross towing weight capacity. Now this hydraulic actuator will activate your trailer brakes when your tow vehicle slows or stops. 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 of your vehicle. So with the surge brake system, this actuator right here is triggered as your trailer moves forward once your tow vehicle starts to slow down. So when this happened, this actuator will contract slides inside here applies force to the master cylinder back here, and then this in turn supplies the hydraulic pressure to engage your trailer brakes. This one is a unique role we designed.

There's two rollers up here, and two right down here, this will help reduce resistance during the telescoping to create a nice straight line movement.If you notice on the end of each roller, they have these grease cert fittings, and that'll allow you to lubricate the rollers very easily with a grease gun. You just put it on the end and pump grease in there. This is a sturdy, durable steel construction, resists bending in any jackknife situations. Now this actuator does include an electric solenoid back here, and that's your electric reverse lockout feature. This'll let you back up without actuating your trailer brakes.

Basically what happens is this electric reverse lockout is automatically activated when you shift your tow vehicle into reverse. So there's two wires here. These wires need to wire into your trailer connector. So when you plug in your trailer connected to your tow vehicle, it can detect when you're in reverse. So when your vehicle goes into reverse, the solenoid will ensure that the hydraulic actuator does not activate your trailer brakes, thus, allowing you to back up your vehicle.Now to use this feature, you do have to have a five-way flat six way round or a seven way trailer connector to hook it up.

If you notice the shield back here, it's a nice built-in shield. That'll protect the solenoid valve from the elements and from any damage. At the front here, it has this offset adjustable channel. It has five different mounting positions for your coupler. One, two, three, four, and five.

Now the coupler that bolts in here is sold separately on our website. And if you notice this channel has a built-in drop. So it's great for tall trailers and that's because of this adjustable channels position so that the mounted coupler in here can sit below the actuator tube, allowing for a greater drop than a standard center mounted channel. So as a result, you can line up your tall trailer with your tow vehicle set to a nice level set up just to give you an idea on the channel size, the height of it is right at 12 inches, the inside width where your coupler will mount into is going to be three inches.And the distance between the mounting holes center to center is right at two inches. This actuator does have a nice prime finish on the outer casing. The inner slide portion is painted. Now this does include this breakaway kit. This chain right here, you can see that stuck to this lever. This will hook onto your tow vehicle. So what this does is in case your trailer gets disconnected from your tow vehicle, this chain will be hooked to the tow vehicle. It will pull this lever, which will activate the master cylinder to apply the brakes in a runaway situation. So let's breakaway kit has a nice safety feature to have. This is a weld on installation. A few specs on this is for trailers with drum brakes, gross towing weight capacity is 20,000 pounds. Maximum tongue weight capacity is 2000 pounds, and this is designed to fit onto a straight three inch wide trailer tongue. But that should do it for the review on the Titan adjustable channel hydraulic drum brake actuator with reverse lockout and a 20,000 pound gross towing weight capacity..

Ratings & Reviews

5.0

1 reviews
Review sort icon
Surge brake actuator with adjustable drop channel lets you mount a coupler in 1 of 5 positions to fit your application. Electric lockout lets you back up without activating trailer brakes. Roller design reduces resistance. Made in the USA.

by:

Well made has function well for the last year no problems whatsoever

Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

4/25/2025

Thanks for coming back to let us know how you like the coupler after a year. What kind of trailer did you put this on, Kevin?

Kevin C. profile picture

Kevin C.

4/26/2026

Great hitch


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See what our Experts say about this Dexter Brake Actuator

  • Different Configurations for the Titan Brake Actuator 20K for Drum Brakes
    There are several different versions of the Titan Brake Actuator like bolt-on, part # T1664900. In regards to the attachment selection, there are multiple different options for this as well. The now discontinued T1055100 is with no attachment so you'd need to supply your own but it does come with a channel mount like part # T4856920, a lunette ring like part # T1297400, and a standard coupler like part # T2477600. There are also different finish and weight capacity options. If you can...
    view full answer...

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Wilson B
Updated by:
Wilson B
Employee Hannah L
Updated by:
Hannah L
Employee Manda E
Updated by:
Manda E
Employee Ryan F
Updated by:
Ryan F
Employee Amanda M
Written by:
Amanda M

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