Backup valve installs in trailer brake actuators with high psi ratings and wires into your tow vehicle so that the trailer brakes do not activate when you shift your tow vehicle into reverse. Call 800-298-8924 to order Titan Accessories and Parts part number T4748800 or order online at Free expert support on all Titan products. Guaranteed Lowest Price and Fastest Shipping for Replacement Solenoid Valve for Titan Brake Actuators with Reverse Lockouts. Accessories and Parts reviews from real customers.
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Accessories and Parts > Trailer Coupler > Replacement Parts > Brake Actuator Parts > Master Cylinder Parts > Solenoid > Titan

Replacement Solenoid Valve for Titan Brake Actuators with Reverse Lockouts

Titan Accessories and Parts

(31 reviews)

Code:   T4748800


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Shipping Weight: 0.42 pounds


Titan Accessories and Parts - T4748800

Backup valve installs in trailer brake actuators with high psi ratings and wires into your tow vehicle so that the trailer brakes do not activate when you shift your tow vehicle into reverse.


  • Installs in trailer brake actuator to prevent trailer brakes from locking when in reverse
  • Designed for use with Titan Model 6, Model 60, Aero 7500, and newer Model 10 and Model 20 actuators
    • For 2000 and older Model 10 actuators, an adapter (T4750200 - sold separately) may be necessary for installation
  • Also fits Dico Models 10, 20 and 60 actuators

4748800 Titan Solenoid Valve

Video of Replacement Solenoid Valve for Titan Brake Actuators with Reverse Lockouts

Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.

Video Transcript for Titan Replacement Solenoid Valve Installation

Today on our boat trailer were going to be installing the Titan brake actuator solenoid valve for reverse lockout, part number T4748800. Well first remove the nipple out of the back of the brake master cylinder of our actuator. Then we can go ahead and take the new solenoid, thread it directly into the back of the master cylinder. Now for this application well need to relocate the brake line so that we can run it directly into the back of the solenoid. To do this were going to go ahead and make a mark and then drill out a hole. Now weve got our pilot hole drilled out well use a step fit process to move up to a nine-sixteenths.

Now with our first hole drilled out well move back on the frame and drill out a second hole. Once we have it to our nine-sixteenths size we can then take the cutoff wheel and cut out the section between the two holes. Now that we have our cutout made, using a socket carefully bend the line to go into the actuator, being extremely careful not to crimp the line. Once we have the line bent we can go ahead and install it into the back of the actuator and tighten it down, being careful not to over tighten it because over tightening can cause the brass fitting to break. Now that the solenoid is secure well go ahead and install the brake line.

Now with all our components installed well need to bleed the air out of the braking system. To do this well open up the bleeder on the brake caliper and remove the cap from the master cylinder, and well also make sure we have a full master cylinder. After a bit of time the air will self-bleed out of the bleeder, assisting in getting the air out of our system. After you gravity bleed it its recommended to do a vacuum assist, or manual power bleed. Once weve bled all the air out of the system were ready to hit the road.

For additional protection of our solenoid well add the Titan Solenoid shield. To install this shield well remove the four fasteners here at the back of our actuator, two on the side and two in the top. These will line up with the shield. Well first line the top hole fasteners up and install them finger tight. Then well flex the shield down until the side fasteners line up with the predrilled holes in our actuator.

Once they line up well go ahead and reinstall the side fasteners and secure them. Then we can go back to the top fasteners and secure them.That does it for the install of the Titan brake actuator solenoid valve for reverse lockout, part number T4748800 on our boat trailer. .

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Customer Reviews

Replacement Solenoid Valve for Titan Brake Actuators with Reverse Lockouts - T4748800

Average Customer Rating:  4.5 out of 5 stars   (31 Customer Reviews)

Backup valve installs in trailer brake actuators with high psi ratings and wires into your tow vehicle so that the trailer brakes do not activate when you shift your tow vehicle into reverse.

- T4748800

by: D Hunt05/04/2011

This review is not intended to persuade you to buy or not buy this solenoid. If you need one, you have to have it. But I will caution you based on my experience to be careful with it. The device has 1" wrench flats to secure it, but only an 1/8" pipe threaded nipple that is unreinforced, soft brass going into the master cylinder. My coupler has guide pins out the rear that prevent a 1" wrench from fitting around the solenoid properly. So I tried to tighten the thing at an angle and of course accomplished little other than to prove how fragile the thing is and break it right off. I'm not impressed with the design, but that's how they made it. My solution is to extend a short pipe out of the master cylinder to clear the pins and be much more careful assembling it next time. It isn't for heavy hands. 12856

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by: Ian03/03/2013

Great product exactly as described and reasonably priced 68514


works fine, happy with the transaction.

Ian - 09/04/2014


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by: Matt W.04/21/2014

fast delivery and exactly as ordered 126330


still working like new

Matt W - 04/21/2015


- T4748800

by: Chuck09/19/2014

Fit perfectly and works great. Type of delivery method needs to be more clear. UPS w/USPS is different from UPS. We had to fight with the post office to get because we have no mail delivery at our house but we do get UPS FEDEX. The Post Office said they should be sending it back because we are not allowed to intercept mail. But we talked them into giving it to us, Thank heavens for the tracking number. 152194

- T4748800

by: Ed K.06/07/2014

This was the only item that I bought from you that didn't meet expectations. I was in the process of installing it by hand onto the master cylinder when the front brass fitting broke off. I never even got to tighten it by wrench. I don't know if it was cracked from the start or just poor quality brass, in wither case, it was unusable. The master cylinder and cover are just fine and work perfectly. 134646

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by: John M.08/15/2014

eTrailer delivered the correct part, on time and at a good price. The solenoid valve itself has a small 1/8" NPT male thread with large 7/8"(?) wrench flats. Be careful tightening... Also, the solenoid wires are both black. It doesn't matter which one is ground and which is powered. (It took me a few minutes to figure that out.) 146925

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by: alan04/20/2015

The support was great. The only issue I had was more towards the manufacturer of my trailer. This valve was listed as a replacement for the original that came with the trailer, when in fact, the original orifice was 1/4 inch and this one has one is 1/32. I was assured by Master Trailer Mfg. that it would work without issues. 186407

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by: Randy M.04/07/2014

Simple and straight forward. Not often do you get a PO acknowledge and ASN for such a small order as a random customer. Would buy again from based on experience. Only wish - Have freight collect on account as an option for UPS and/or FedEx services. 123988

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by: Blake A.05/17/2014

Replaced the exact OEM solenoid from my Titan model 10. Have it installed but not wired into the system, so functional check will come later. Thank you for the great price and quick shipping. 131080

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by: Mr Edward L Jarrett11/13/2014

these work very well and are very easy to install. But they are very fragile, Something saying to view the available video or a note mentioning the fragility would be an excellent idea. 160731

- T4748800

by: Steven04/12/2015

As others mentioned the brass is very flaky. Nipple broke inside and it took a lot of time to remove and re-thread. The guys at E-trailer are a class act. Always. Two thumbs up. 184805

- T4748800

by: Randy E.05/18/2013

Works perfectly, If you have a trailer with surge/disk brakes this is a must. Easy to install. The optional shield (Part # T4835800183) Gives much needed & added protection. 80840

- T4748800

by: Shawn Arbogast06/19/2014

the products arrived earlier than were expected which was nice.I had a question about one of my products and the staff was very helpful getting me on track. Thank You 136635

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by: Don B08/09/2013

Works fantastic. My wife loves it - she can now back the trailer up without having to manually lock the surge brake every time... The old one never worked.Thank you! 94171

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by: James H05/27/2015

Customer service was very helpful in getting me the correct product for my trailer brakes. I would recommend this company and their products. Thanks very much. 198135

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by: Chip W06/29/2015

The product was shipped very quickly and arrived two days before tracking said it would. Have ordered before from etrailer and will continue to do so. 208104

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by: Ron S07/01/2015

service and shipping were excellent I have not installed the solenoid as of today so I can't comment on its operation on the surface it looks good 208607

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by: Mark S.09/17/2013

Worked like a champ, and was delivered on the third day after ordering. High quality product and prompt service. 100287

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by: tim l08/13/2014

adaptor that screws into master cylinder should be made from steel and not brass first one broke off to easy 146587

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by: Burizoon02/07/2014

Works as expected. Installed on car hauler with Hydraulic Disc Brakes. No problems. quick shipping. 116010

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by: Jeff A09/16/2011

The service was amazingly fast and accurate. The item I ordered was exactly what I needed. Thanks! 24056

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by: James K06/29/2015

Arrived in excellent packaging! Will definitely look for more items in the future! Thanks 208095

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by: Mike K06/02/2011

Excellent customer service and fast shipping. Will use again for future trailer needs. 15958

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by: Brian R09/15/2014

Works well in locking out my brakes so I can back my boat trailer up. 151101

- T4748800

by: Dan J10/22/2014

Shipping was incredibly fast and inexpensive. Well Done! 157542

- T4748800

by: Elliot L07/07/2011

Fast reliable service. Even with a holiday weekend. 18820

- T4748800

by: Dennis Burgeson06/15/2015

Exact replacement part. Works perfectly. 203487

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by: D Owens06/05/2015

Great product and easy to install. 200754

- T4748800

by: Wayne03/25/2014

Great service nice price thanks 122171

- T4748800

by: Doug M08/12/2013

Would recommend to a friend. 94607

- T4748800

by: J10/14/2012

VERY NICE! 57172


Ask the Experts about this Titan Accessories and Parts
Do you have a question about this Accessories and Part?

  • How to Activate Boat Trailer Surge Brake Lockout from the Factory 7-Way on a 2012 Toyota Tacoma
  • It sounds like you have a factory 7-Way connector on your 2012 Toyota Tacoma and that you also have the dealer supplied electric brake controller wiring harness for wiring an electric brake controller in the cab of your vehicle. Since your boat trailer is equipped with surge brakes, you will not need to install an electric brake controller in the cab of your Tacoma. The first thing you should do is check the center pole, see photo, in the 7-Way connector on your vehicle with a circuit...
    view full answer...

  • Can the Titan Disc Brake Kit and Aero 7500 Actuator w/ Manual Lockout Be Locked Out Electrically
  • Yes, the Titan Aero 7500 Brake Actuator with Manual Lockout - Bolt On - Disc - 2 inch Ball - 7,500 lbs, item # T4606500, that comes in the Titan Disc Brake Kit and Aero 7500 Actuator w/ Manual Lockout - Single, 3,500-lb Axle, item # T4843500, needs to be manually locked out when backing the trailer. Disc brakes on trailers work equally as well in reverse as they do when going forward so backing without locking out is not an option. When backing, damage can be done to the actuator if not...
    view full answer...

  • Installing a Surge Brake Actuator on a Truck Bed Trailer Axle with Factory Drum Brakes
  • Yes, you can use a hydraulic surge brake actuator on a 3/4 ton pickup bed with factory hydraulic drum brakes. I produced a short video showing the actuator I recommend and explaining the application. You would want to use a drum brake actuator for OEM drum brakes. You will also need an electric lockout solenoid to lockout the brakes when backing because automotive brakes will apply in reverse. I recommend the Titan Zinc-Plated Brake Actuator, # T4339720, for drum brakes which includes...
    view full answer...

  • Normally Open Reverse Lockout Solenoid for Disc Trailer Brakes
  • The normally open style like # T4748800, will only prevent fluid from going back to trailer brakes when you put the vehicle in reverse. Once the vehicle is in reverse, the normally open solenoid will close and allow you to back up without the brakes engaging. On a normally open system, you will need to be careful when backing up because if you hit a curb or another object it could add even more pressure to the master cylinder and could possibly damage it. A normally closed system...
    view full answer...

  • Parts Needed to Backup Without Putting on the Surge Brakes When Parking or Launching a Boat Trailer
  • Yes, there is a way to back up your boat trailer and keep the surge brake actuator, # T4332900, from applying pressure to the trailer brakes. You will need an electric lockout solenoid, # T4748800, which will close when you shift the vehicle into reverse, allowing the trailer to be backed. Along with the solenoid, you will need a solenoid cover, # T4835800183, if your actuator is the model 60 actuator that you referenced. The cover will keep the solenoid from getting stepped on and damaged...
    view full answer...

  • Repairing or Replacing Hydraulic Drum Brake Components on 14 Year Old Boat Trailer
  • Although it would be a bit more expensive, I would recommend replacing the entire brake assembly on each side, not just the wheel cylinders. This will provide all new parts, and you will know that it will be quite some time before the brake shoes, adjusters or springs will need replacement. The Demco # 40715 and 40716 you referenced would be an acceptable replacement. In my experience, there is not perceptible difference in quality between Demco and Dexter brake assemblies. This being...
    view full answer...

  • Drum to Disc Brake Conversion For Actuator
  • The Titan Trailer Coupler, part # T4079200, is for use with hydraulic drum brakes, and does not have the reverse lockout feature, or the solenoid installed. If you have changed the system from drum to disc, you need to be aware that the disc brake system has a higher pressure requirement. The actuator should be compatible with a disc brake system. Disc brake systems require 1500 psi, where drum brake systems require 1000 psi. I have attached an FAQ article explaining the parts needed to...
    view full answer...

  • Replacement Master Cylinder and Reverse Lock Out Solenoid, Titan Model 10 Trailer Brake Actuators
  • As far as a master cylinder, you will need the Master Cylinder for Titan Actuators, # T4747100, which is designed for Model 10 or 20 Titan actuators and is designed for 1-1/4 inch bore disc brakes. For a reverse lock out solenoid, you will need the Solenoid Valve with Fittings for Reverse Lockout - Normally Open, # T4748800. This solenoid comes with the necessary fittings and installs in-line with the system. Finally, to protect the solenoid, you will need Replacement Back Up Valve...
    view full answer...

  • How To Stop Trailer Brakes For Activating When In Reverse On Incline
  • I can understand the frustration you are having and it is experienced by others who use a manual reverse lockout. What you will need to do is install, Replacement Solenoid Valve for Titan Brake Actuators, part # T4748800. This will not allow the brakes to activate at all when the vehicle is in reverse and you will never have to get out of your vehicle to switch it back and forth. To install, one end will connect the master cylinder, the other end will connect to the brake line. You will...
    view full answer...

  • Hydraulic Trailer Coupler is Locking Trailer Brakes When Trailer is in Reverse
  • Without any background information, it will be hard to say what you have going on. Have you recently replaced the coupler or master cylinder? Did the brakes previously function correctly, but are recently locking up when the vehicle is placed in reverse? Given the information available, my best guess is that either your reverse lock-out solenoid is faulty, one of its wires has become disconnected, or the signal from the reverse light circuit on the vehicle is not reaching the solenoid...
    view full answer...

  • Backing Up Trailer When Using Titan Model 60 Hydraulic Surge Disc Brake Actuator # T4819900
  • The Titan Model 60 Hydraulic Surge Disc Brake Actuator, part # T4819900, does not include a lockout function for backing up the trailer. Couplers are available with either electric or manual lockout, or no lockout. This particular Titan coupler does not offer this function. If you wish you can install additional components to provide this function in your coupler. You will need Titan Solenoid Valve, part # T4748800, and Titan Solenoid Shield, part # T4835800183. The fitting that...
    view full answer...

  • Replacement Master Cylinder and Backup Solenoid for Titan Model 60 Trailer Brake Actuators
  • Since the fitting broke off, there could be other damage to the master cylinder, so I would recommend that if you keep your Model 60 Actuator, replace the master cylinder with # T4820000 for disc brakes or # T4395100 for drum brakes. The Replacement Solenoid Valve for Titan Brake Actuators, is # T4748800. It fits Titan Model 6, Model 60, Aero 7500, Model 10, and Model 20 actuators. I could not find any information on a Model 66.
    view full answer...

  • Titan Actuator and Disc Brake Kit That has Manual and Electric Reverse Lockouts
  • If you needed a brake actuator kit that had both an electric lockout and a manual lockout instead of the disc brake kit part # T4843100 that you referenced you would want the part # T4843500 which has a manual lockout and then you would need to install an electric lock out part # T4748800 as well. Both of these kits come with the same disc brake kits, just different actuators. I attached a review video for the # T4843500.
    view full answer...

  • Brakes Lock Up After Installing Reverse Lockout Solenoid Valve # T4748800
  • I would recommend bleeding your brakes after installing a new Solenoid Valve, # T4748800. The main brake line must be disconnected from the actuator to install this item and anytime the brake lines are disconnected, there is a chance for air or some type of debris to enter the brake lines. The electric lockout solenoid should not cause your brakes to lock up after you come to a complete stop. The solenoid has two wires, one should be connected to the reverse light circuit coming from...
    view full answer...

  • Recommend Replacement Actuator For 2 Inch Ball on My 1989 Karavan Boat Trailer
  • When determining which replacement actuator you will need, you need to determine what is the width of the trailer tongue and the weight capacity of your coupler. The item you selected, Atwood Hydraulic Brake Actuator, part # 84132, has a capacity of 6,000 lbs and fits a trailer tongue that is 3 inches wide. I did some research on the internet and was able to contact Karavan trailers. The representative at Karavan informed me that the actuators they have for their boat trailers has...
    view full answer...

  • Can an Electric Lockout be Added to Titan Trailer Disc Brake Kit, # T4843300
  • There is enough space underneath the Fold Away Coupler in the Titan Disc Brake Kit, # T4843300, to add an electric lockout, # T4748800. With the lockout installed, you will not have to use the manual lockout that comes on the coupler. If you click on the last picture for Actuator, # T4839100, you will see the space underneath.
    view full answer...

  • 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.
    view full answer...

  • Does the Titan Model 60 Trailer Brake Actuator have a Reverse Solenoid with Brake Fluid Return Line
  • The actuator that you have referenced, # T47154007K, does not have a reverse lockout. However, if you were to add one using # T4748800, it works by blocking the flow of fluid back to the brakes when the tow vehicle is placed in reverse. There is no return line for the fluid. The master cylinder in this actuator is # T4820000.
    view full answer...

  • Electric Reverse Lockout is Not Working on a Boat Trailer
  • First, make sure that your trailer has an electric reverse lockout and that the 5th wire is connected to it and not something else. Then, on the vehicle side, check that the center pin wire is connected to a reverse light circuit behind one of the tail lights on the vehicle. You can use a circuit tester like # 3808 if needed to make sure the center pin provides power when the vehicle is put in reverse. Then plug in the adpater you have and make sure that the pin that corresponds to the...
    view full answer...

  • Parts to Replace Hydraulic Brake System on a 2004 Magic Tilt Trailer
  • We can definitely get you started with parts for your Magic Tilt Trailer, but we will need some additional information to complete your parts list. We can start with a coupler. Since your boat trailer will not exceed 10,260 lbs, I recommend looking at a coupler like the Titan Zinc-Plated Brake Actuator for Disc Brakes, # T4750610. This coupler has a 3 inch drop like the coupler you referenced, but it has a 12,500 lb weight capacity which is closer to the weight of your trailer. Using...
    view full answer...

  • 7,000 lb Hyudraulic Actuator for Drum Trailer Brakes with Trailer Brake Lock Out for Backing Up
  • The Titan Leverlock Brake Actuator, # T43329007K, that you referenced does not include a lockout system for backing your trailer, but an electric lockout solenoid, # T4748800, can be added to allow you to back the trailer. At this time we do not have a 7,000 lb coupler with a reverse lockout factory installed. Along with the solenoid you will need a shield, # T4835800183, to protect the solenoid from damage, and you will need to upgrade the 4-Way connector on your truck and trailer to...
    view full answer...

  • Troubleshooting Trailer Surge Brake Tongue Slamming Forward and Back
  • It sounds like the shock in your surge brake actuator is in need of being replaced. The shock will act as a dampener to allow the coupler to return slowly and apply the brakes in a controlled manner. The loud banging noise you are hearing also supports this. In order to replace the shock we first need to know what coupler you have. If you can email me back with pictures and any model names or numbers you can find I'll help you track down the correct shock. For example, if you had a Titan...
    view full answer...

  • Does Titan Trailer Coupler, # T4715400, Need A Solenoid Valve When Trailer Is In Reverse
  • On the Titan Trailer Coupler, # T4715400, you need to add a separate solenoid to disable the brakes when using reverse. You will use the Titan Solenoid Valve with Fittings for Reverse Lockout, # T4748800, which is a normally open valve. It is internally grounded so you just have the one wire to attach to the reverse light circuit. You will also need the Titan Solenoid Valve Cover, # T4835800183, that will attach to the actuator and protect the solenoid from the weather. The difference...
    view full answer...

  • Can the Electric Reverse Lockout Solenoid be Used on a Titan Model 60 Trailer Brake Actuator
  • It sounds like your model 60 actuator is for drum brakes and it has the check valve inside the master cylinder. You can use the electric reverse lock out solenoid # T4748800 with the model 60. It will attach directly to the master cylinder and the brake line will attach to the other end. When the vehicle is in reverse, it will not allow fluid to go back to the brakes. The electrical connection needs to be made to the vehicle reverse light circuit. You will also want to protect the solenoid...
    view full answer...

  • Replacement Titan Master Cylinder and Backup Solenoid Needed For My Titan Model 60 Actuator
  • For a replacement master cylinder you will need the Titan Replacement Master Cylinder, part # T4395100, to use with your Titan Model 60 Actuator. Then, you will want to use the Titan Replacement Solenoid Valve, part # T4748800. This Titan Replacement Solenoid Valve # T4748800 will stop the brakes from activating when you are in reverse. You may also be interested in the Titan Solenoid Shield, part # T4835800183, which will protect the coupler from being stepped on if you do not already...
    view full answer...

  • How Does the Atwood Reverse Lock Out Solenoid Install on an Atwood Actuator
  • I can tell you how the Solenoid Kit part # T4748800 intalls, and it comes with an instruction manual, but I could not get a copy to show you. One of the two black wires (doesn't matter which one) will run to the reverse light circuit of your tow vehicle. The other will get grounded to your trailer. The male fitting of the solenoid will thread onto the back of the master cylinder. The female side will thread to the brake line that runs to your trailer brakes. The rubber line of the...
    view full answer...

  • How To Stop Brakes On Trailer From Locking When In Reverse Using Titan Model 10 Brake Actuator
  • What you will need to do is install the Replacement Solenoid Valve, part # T4748800. The Titan Replacement Solenoid Valve # T4748800 will stop the brakes from activating when you are in reverse. You may also be interested in the Titan Solenoid Shield, part # T4835800183, which will protect the solenoid valve from being stepped on if you do not already have a cover.
    view full answer...

  • Can an Electric Back Up Lockout Solenoid be Added to a Titan Aero 7500 Brake Actuator
  • The Titan Aero 7500 Brake Actuator with Manual Lockout, item # T4606500, has a manual lever, on the side of the coupler, that requires getting out of the vehicle and activating to back the trailer without the brakes activating, see page 7 of instructions link. An electric lockout solenoid can be added to the Titan Aero 7500 Brake Actuator, which will use the reverse light function from your vehicle to lockout the trailer brakes whenever the vehicle is shifted into reverse. The Replacement...
    view full answer...

Do you have a question about this Accessories and Part?

Info for this part was:

Photos by:
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Expert Research:
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Video Edited:
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Updated by:
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