1. Brake Actuator
  2. Titan
  3. Surge Brake Actuator
  4. Disc Brakes
  5. 2-5/16 Inch Ball Coupler
  6. 12500 lbs GTW
Titan Zinc-Plated Brake Actuator w/ Electric Lockout - Disc - 2-5/16" Ball - 12,500 lbs

Titan Zinc-Plated Brake Actuator w/ Electric Lockout - Disc - 2-5/16" Ball - 12,500 lbs

Item # T4750820
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Brake Actuator
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Shipping Weight: 52 lbs
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Corrosion-resistant, surge-type actuator bolts over 3" wide trailer tongue and includes standard, heavy-duty coupler. Electric reverse lockout lets you back up without activating the trailer brakes. Unique roller design helps reduce resistance. Call 800-298-1624 to order Titan brake actuator part number T4750820 or order online at etrailer.com. Free expert support on all Titan products. Guaranteed Lowest Price and Fastest Shipping for Titan Zinc-Plated Brake Actuator w/ Electric Lockout - Disc - 2-5/16" Ball - 12,500 lbs. Brake Actuator reviews from real customers.
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  • Reviews (8)
  • Q & A (0)
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Titan Brake Actuator - T4750820

  • Surge Brake Actuator
  • Disc Brakes
  • 2-5/16 Inch Ball Coupler
  • 12500 lbs GTW
  • Bolt-On
  • Electric Lockout
  • Titan
  • Straight Tongue Coupler

Corrosion-resistant, surge-type actuator bolts over 3" wide trailer tongue and includes standard, heavy-duty coupler. Electric reverse lockout lets you back up without activating the trailer brakes. Unique roller design helps reduce resistance.


  • Hydraulic actuator synchronizes trailer brakes with tow-vehicle brakes
  • Electric reverse lockout lets you back up without actuating trailer brakes
    • Built-in shield protects solenoid valve from the elements
  • Unique roller design reduces resistance during telescoping to create straight-line movement
  • Sturdy, durable steel construction resists bending in jackknife situations
  • Standard, heavy-duty coupler
  • Breakaway kit included
  • Zinc plating is corrosion resistant
  • Bolt-on installation


  • Application: disc brakes
  • Ball size: 2-5/16"
  • Mounting: 3" wide channel tongue
  • Capacity: 12,500 lbs
  • Maximum tongue weight: 1,250 lbs
  • 1-Year warranty

When you apply the brakes in your tow vehicle, deceleration occurs and momentum pushes your trailer toward the rear of your vehicle. With surge brake systems, the actuator is triggered as your trailer moves forward while the tow vehicle slows. The actuator telescopes, applying force to its master cylinder, which in turn supplies the necessary hydraulic pressure to engage the trailer's brakes.

Electric reverse lockout with solenoid is automatically activated when the tow vehicle is shifted into reverse. To use this feature, you must have a 5-pole flat, 6-way round or 7-pole wiring harness.

068-508-20 Titan Model 10 Actuator with 2-5/16" Ball Standard Coupler - Disc Brakes - Solenoid Lockout and Cover - Zinc

Replaces 4750820

Customer Reviews

Titan Zinc-Plated Brake Actuator w/ Electric Lockout - Disc - 2-5/16" Ball - 12,500 lbs - T4750820

Average Customer Rating:  4.3 out of 5 stars   (8 Customer Reviews)

Corrosion-resistant, surge-type actuator bolts over 3" wide trailer tongue and includes standard, heavy-duty coupler. Electric reverse lockout lets you back up without activating the trailer brakes. Unique roller design helps reduce resistance.

- T4750820

I replaced a twenty four year old coupler with the Titan T4750820. My previous system had a separate coupler, hydraulic pack, and battery box. I could not keep up with the effects of salt water and time. It became a maintenance and safety nightmare. The installation of a titan hydraulic coupler and a Tekonsha P3 brake controller has restored my confidence in my braking system. The staff at etrailer.com was first class in answer all my questions and making sure I got the right gear the first time.

- T4750820

Love the coupler, heavy, built well, nice unit. I only wish e-trailer would of notified me that it was on back order prior to taking my money. Ended up moving a vacation back about a month because of it.

- T4750820

CUSTOMER SERVICE : A++ VENDOR INTEGRITY: Item appears as advertised. No used parts detected. PRODUCT QUALITY: Untested at this requested evaluation due to needed repair. PACKAGING: Poor - Product arrived with minor damage. Required taking to machine shop to repair. Unwelcome delay and expense. INSTALLATION: No printed installation instructions; online instructions result in "file not found".

EASE OF INSTALLATION: Definitely not plug and play. RELIABILITY: Excellent. DURABILITY: Product used exclusively in salt water environment. Still looks new. No Rust! RECOMMEND TO OTHERS: Yes, but know you are in for a major task.
Philip D - 09/02/2018

- T4750820

The latch is a pain, it's always getting stuck. It is such a pain that I just ordered the Demco. Save yourself the headache and buy the better product from the get go.

- T4750820

Well made and reasonably priced

- T4750820

Excellent service and time of delivery! Recommended

- T4750820

- T4750820

very good poor delivery out time


Ask the Experts about this Titan Brake Actuator

  • Will the Titan T4750820 Actuator Replace Global Direct Components GDC-120 Without Drilling New Holes
    Since the Titan Zinc-Plated Brake Actuator # T4750820 that you referenced has a weight capacity of 12,500 lbs and a tongue weight capacity of 1,250 lbs it will serve well as a replacement actuator for your application. The mounting holes are spaced differently than what you show which means you will need to drill new holes into your trailer tongue. Your mounting holes are spaced in a straight line where the mounting holes for the Titan actuator form more of an arc. Instead of the...
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  • Disc Brake Recommendation for a Triple Axle Boat Trailer
    Since you will putting the disc brakes on a boat trailer I recommend going with something that will be corrosion resistant. For that I recommend Kodiak disc brake kit # K2HR35DS. It is constructed using stainless steel parts and other parts have a Dacromet coating for superior corrosion resistance. This is a complete kit for 1 axle. This kit has rotors that use inner bearing L68149 and outer bearing L44649. If you have different bearing numbers this kit can still work as long as the...
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  • Recommended Surge Brake Actuator for Tandem Axle Boat Trailer
    A surge brake actuator will need to be based off of the gross vehicle weight rating (GVWR) of the trailer with the boat loaded. As long as the boat and trailer do not weigh more than 12,500 lbs I recommend using the Titan Zinc-Plated Brake Actuator part # T4750820. The Titan actuator will bolt onto a 3" wide straight tongue trailer, fits a 2-5/16" hitch ball, and has an electric reverse lockout solenoid. The actuator has a zinc plating for corrosion resistance as well as an integrated...
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  • Recommended Replacement Surge Brake Actuator and Disc Brakes for Boat Trailer
    Is the trailer's GVWR 5,200 pounds or is that the axle capacity? If it's the axle capacity and a tandem axle trailer I recommend the Titan brake actuator, part # T4750820, that's rated for up to 12,500 pounds. If the trailer's maximum weight capacity is 5,200 pounds then instead I suggest part # T4745720. Both are zinc-plated to preven corrosion and include an electric lockout. If your axle isn't rated for 5,200 pounds let me know so I recommend the correct disc brakes. If they are...
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  • How to Install the Backup Solenoid on Titan Disc Brake Actuators
    The Fitting in the back of your actuator, # T4750820, will need to be removed to install the Solenoid Valve for Titan Brake Actuators, # T4748800. I have posted a photo showing this fitting. Once the fitting is removed you will install the solenoid valve directly into the back of the master cylinder, see second photo, then attach the brake line from the trailer directly to the solenoid. The fitting that was removed will not be needed.
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  • Replacement Coupler on Trailer for GDC-100
    We don't have replacement parts for a GDC 100 actuator but we do have replacements for it that would work great like the # T4750820. This is a higher capacity disc brake actuator with an electric lock out.
    view full answer...
  • Advantages of Manual vs. Electric Reverse Lockout on Actuator Coupler
    A trailer actuator-coupler with an electric reverse lockout feature, such as Titan # T4750820, allows you to reverse your trailer without having to get out of the vehicle to first engage a manual lockout lever. The internal solenoid in the actuator takes care of this automatically when you shift the vehicle into reverse; that reverse light signal is the trigger that tells the actuator to block the flow of fluid through the brake lines. Blocking the flow of brake fluid allows reversing the...
    view full answer...
  • Converting EZ Loader Tandem Axle Aluminum Boat Trailer to Disc Brakes
    A great place to start your boat trailer brake conversion project is the linked article that covers the topic of changing a trailer to disc brake operation. The article includes links and details about the whole conversion process. If you choose to convert your tandem axle aluminum boat trailer from hydraulic drum to hydraulic disc brakes you will also need to replace your actuator since disc brakes require higher pressure to operate. You may be able to replace just the master cylinder...
    view full answer...
  • Recommended Surge Brake Actuator For 7800lb Tandem Axle Boat Trailer W/ Disc Brakes
    You would have no problems what so ever going with an 8000lb rated coupler since you are only at 7800lbs, and going with a 12500lb coupler would cause a little more jerky braking due to the different size springs used for the trailer to apply the brakes. With that said I recommend the Titan Zinc-Plated Brake Actuator w/ Lockout Shield - Disc - 2-5/16" Ball - 8,000 lbs # T4747210 which is rated for 8000lbs and is designed for disc brakes like what is on your trailer. I included a...
    view full answer...
  • Are Replacement Parts for the GDC-100 Available
    I may have a solution for you, but we don't have replacement parts for a GDC-100 actuator. It looks like the GDC-100 is a heavier duty actuator designed to work with disc brakes, so the # T4750820 would be a good option to use as a replacement. This is a higher capacity disc brake actuator with an electric lock out, so it's ideal for a boat trailer that has disc brakes..
    view full answer...
  • Replacement for GDC120 Actuator for Heritage Triple Axle
    The Titan Actuator part # T4750820 would be a great solution for replacing the GDC 120 you have on your triple axle boat trailer. It has more than enough capacity and is a very reliable actuator.
    view full answer...
  • Troubleshooting Electric Reverse Lockout on Titan Model 10 Coupler
    The Titan Model 10 Actuator # T4750820 uses an electric reverse lockout that relies on the signal from the vehicle's reverse light circuit. That signal engages the lockout solenoid that prevents the actuator from compressing (and engaging the brakes) when you back up. If your vehicle's trailer connector has damage to its reverse light signal wire this would cause the brakes to remain engaged. You can refer to the linked photo of a 7-way vehicle socket to note that the center pin is usually...
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  • Troubleshooting a Leaking Reverse Lock Out Solenoid
    Over tightening the fitting can cause it to never seal again properly. Your best option would be to make sure you have the line perfectly square in the fitting as you tighten it. Flexible line will have to be used. I attached an install video for the Solenoid part # T4748800.
    view full answer...
  • How Does an Electric Reverse Lockout Solenoid on a Titan Coupler Get Wired
    On the reverse lockout solenoid on Titan coupler # T4750820, one wire will need to be grounded to the trailer frame. The other wire needs to connect to the reverse light circuit on the trailer side connector. When the vehicle is placed in reverse it powers the solenoid and will not let fluid back to the brakes allowing you to back the trailer without the brakes engaging.
    view full answer...
  • Dimensions Of Titan Zinc-Plated Brake Actuator w/ Electric Lockout T4750820
    I had our warehouse measure the Titan Zinc-Plated Brake Actuator w/ Electric Lockout - Disc - 2-5/16" Ball - 12,500 lbs # T4750820 you mentioned and it is 26-1/2" long, 5" deep not including the mounting bracket, 8" deep including the mounting bracket, 4" wide at the narrowest point, and 6" wide at the widest point which is the heads of the bolts on each side. I included a diagram of these measurements for you to take a look at.
    view full answer...
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  • Availability of Disc Brake Actuator/Coupler Without Electric Reverse Lockout Feature
    An electric reverse lockout solenoid like Titan # T4748800 is included in their disc brake actuator/coupler # T4750820 which you referenced. Electric lockouts can be retro-fitted to a compatible coupler; they can also be removed if you wanted to eliminate the reverse lockout feature. Titan actuator/coupler # T4750820 that you referenced fits a 3-inch-wide trailer tongue, includes a breakaway kit and bolts on to your trailer tongue. If you prefer a disc brake actuator/coupler without...
    view full answer...
  • Weight of the Titan Zinc-Plated Brake Actuator T4750820
    The Titan Zinc-Plated Brake Actuator # T4750820 that you referenced weighs 52 lbs which translates to 23.5 kilograms.
    view full answer...
  • Dimension of the Titan Brake Actuating Coupler
    The Titan Zinc-Plated Brake Actuator w/ Electric Lockout - Disc - 2-5/16" Ball - 12,500 lbs # T4750820 has a shipping weight of 51 lbs. I can't specify the size of the item packed as the shippers can utilized different size boxes as they see fit to protect the product.
    view full answer...
  • Replacement Titan Brake Actuator for Titan 3241639
    We've checked the part number you gave us before and the replacement for it is the part # T4750820 which is for disc brakes. This one does come with a reverse lock out solenoid. If it has rust all over it I'd consider just replacing the entire thing and starting over with everything new. If you can get me the capacity of your axles and the bolt patterns I can help you pick out stainless steel brake components that won't rust as well.
    view full answer...
  • Replacement Titan Surge Brake Actuator for Model 10 Part 3241639
    The replacement Titan actuator for your Model 10 with part number 3241639 is listed on our site as the Titan Zinc-Plated Brake Actuator w/ Drop, Electric Lockout # T4750620. My contact at Titan confirmed this.
    view full answer...
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  • Replacement Brake Actuator For A Gross Trailer Weight Of 10,000 Lbs.
    Absolutely, the brake actuator we have that most closely matches your gross trailer weight (GTW) of 10,000 lbs, is our Titan Zinc-Plated Brake Actuator part # T2478100. If you do not wish to have a 3" drop for the hitch ball, you will want part # T2477600. The Titan actuator is rated for a gross trailer weight up to 12,500 lbs and will fit over a 3" wide trailer tongue. If you are using disc brakes then you will need the Titan Zinc-Plated Brake Actuator w/ Electric Lockout part # T4750820.
    view full answer...
  • Is Titan 10,000 Pound Brake Actuator Compatible with Kodiak Stainless Steel Disc Brakes
    For your brake actuator to be compatible with your Kodiak stainless steel brakes, the actuator will need to be a disc brake actuator. Kodiak only makes disc brakes. If your actuator is a drum brake actuator, not a disc brake actuator, it will not be compatible with the Kodiak disc brakes. If your Titan actuator is made for disc brakes, it will work well with your Kodiak brakes. The Replacement Master Cylinder Assembly # T4749501042 is only compatible with Titan Model 10 and Model 20...
    view full answer...
  • What Components Are Needed To Convert Electric to Hydraulic Disc Brakes On 12K Trailer
    I have attached a link to a helpful article that explains everything that is needed when adding hydraulic disc brakes to your trailer. In addition to a kit like part # K2R1258L12 you will need to make sure you have the right brake mount flange, and you will need to add hydraulic brake lines to your trailer. You will also need a surge brake actuator like part # T4750820 installed on your trailer frame. I have attached links to the brake lines we offer, and to the actuators we offer.
    view full answer...
  • How to Identify Correct Replacement Brake Actuator Coupler for Triple Axle Boat Trailer
    You can easily see whether you have drum or disc brakes on your triple-axle boat trailer by simply removing one wheel. You will then see either a hub/drum assembly like # AKHD-545-35-EZ-K if you have drum brakes or a hub/rotor assembly and a brake caliper like those in kit # K2HR526D if you have disc brakes. You'll need to select a replacement actuator of the appropriate type to match the brakes on the trailer. We offer both drum and disc brake actuator couplers. These have different...
    view full answer...
  • Complete Disk Surge Brake Setup Recommendation for a Rogue Tandem Axle Boat Trailer
    We have everything you need, just not in one kit. For a disk brake kit that will bolt up to your 4 bolt brake flanges and will slip over your 5 on 4-1/2 inch bolt pattern you would want the part # K2R35D for a dacromet finish. Or if your trailer will see salt water I would recommend the stainless steel kit part # K2R35S. You will need a quantity of two of these kits for both axles. For a brake line kit you will need the part # DM5425. And then for a surge brake actuator you would...
    view full answer...
  • Best Replacement for Tie Down Surge Brake Coupler Model 125 Disc
    The best replacement option we offer for a Tie Down Surge Brake Coupler Model 125 for Disc Brakes is the Titan Zinc-Plated Brake Actuator part # T4750800. The Titan coupler is rated for 12,500 lbs just like the Tie Down and it uses a 2-5/16" hitch ball. It is also rated for use on disc brakes. If you have a model with lock solenoid or wish to add this feature then you would simply use part # T4750820. There should also be a set of holes on the new coupler which matches what you have...
    view full answer...
  • Parts Needed to Convert Titan Model 6 Drum Brake Actuator # T4079200 to 4-Disc Brake Operation
    It is possible to rebuild a drum brake actuator to handle the higher pressure and fluid displacement required for disc brake assemblies. However, in the case of your four Kodiak disc brakes (part # K1HR35D) for use on a tandem axle trailer these will require more fluid displacement than can be provided even by a modified Model 6 actuator. A drum-to-disc-modified Model 6 actuator could handle the requirements of two brake assemblies but not four, according to my contact at Titan. He...
    view full answer...

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