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Dexter Galphorite Free-Backing Hydraulic Trailer Brake Assembly - 10" - Right Hand - 3,750 lbs

Dexter Galphorite Free-Backing Hydraulic Trailer Brake Assembly - 10" - Right Hand - 3,750 lbs

Item # T4423400
Our Price: $89.59
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Shipping Weight: 10 lbs
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Drum brake assembly provides superior protection from corrosion and lets you reverse without actuating. Designed for use with hydraulic brake actuators that do not include reverse lockouts. Fits most 13", 14" and 15" wheels. 1-800-940-8924 to order Dexter accessories and parts part number T4423400 or order online at Free expert support on all Dexter products. Great prices and Fastest Shipping for Dexter Galphorite Free-Backing Hydraulic Trailer Brake Assembly - 10" - Right Hand - 3,750 lbs. Accessories and Parts reviews from real customers.
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Dexter Accessories and Parts - T4423400

  • Trailer Brakes
  • Hydraulic Drum Brakes
  • Brake Assembly
  • Dexter
  • 10 x 2-1/4 Inch Drum
  • RH
  • 3500 lbs
  • Free Backing

Drum brake assembly provides superior protection from corrosion and lets you reverse without actuating. Designed for use with hydraulic brake actuators that do not include reverse lockouts. Fits most 13", 14" and 15" wheels.


  • Galphorite plating delivers superior corrosion protection
    • Backing plate and shoe levers are sealed with permanently bonded electrocoat primer
    • Second coat of rugged acrylic is applied to backing plate - nearly rustproof
    • Wheel cylinders are treated with hot black oxide
    • Internal components are olive drab, zinc plated
    • Stainless steel springs
  • Free-backing design lets you reverse without trailer brakes being activated
    • Specifically designed for use with surge-style trailer brake actuators
    • Hydraulic pressure is contained by wheel cylinder


  • Right-hand assembly - passenger's side
  • Dimensions: 10" wide x 2-1/4" thick
  • Pad lining: 44 sq in
  • Wheel size: 13", 14" or 15"
  • Mounting flange bolt pattern: 4 bolt
    • 2-7/8" Distance between mounting holes
  • Mounting bolts, lock washers, and nuts sold separately
  • Center hole diameter: 3"
  • Axle rating: up to 3,750 lbs
  • 1-Year warranty
    • 2-Year corrosion warranty

The unique free-backing design, patented by Titan, lets your trailer move in reverse without actuating the brakes. When you begin backing up, the brake shoes are firm against the drum, as in a braking situation. As you continue in reverse, however, the shoes turn with the drum until the lining pressure is released and you are able to back up freely.

These brakes are designed to eliminate friction between the shoes and drum when you are driving in reverse. A trailer breakaway kit will not be effective should your trailer disconnect from your tow vehicle when backing up.

023-549-00 Dexter Axle Premier Freebacking Brake Assembly - 10" x 2-1/4" - Right

Replaces Titan 4423400 and 4423400E

Customer Satisfaction Score:

Customer Reviews

Dexter Galphorite Free-Backing Hydraulic Trailer Brake Assembly - 10" - Right Hand - 3,750 lbs - T4423400

Average Customer Rating:  4.8 out of 5 stars   (53 Customer Reviews)

Drum brake assembly provides superior protection from corrosion and lets you reverse without actuating. Designed for use with hydraulic brake actuators that do not include reverse lockouts. Fits most 13", 14" and 15" wheels.


I own an auto repair shop and I buy parts all day. This product fit like it was meant to. I received them in a very timely manor. I will use etrailer for future parts again and have added them to my favorites bar. Thanks.


Here's a video I did of the brake installation on my trailer. I got the actuator from a buddy who had bought it years ago and never took it out of the box! The only comment I would have, and you can see from the video, is that the single axle brake line kit didn't do it. I had to buy a connector and another line. No big deal on my end, but it might be for others. Also, my trailer already had drums, just no brakes. I was able to get the drums turned okay.


I have used this product previously and found it to be of excellent quality it fit my application perfectly and works flawlessly .the service at e- trailer is also excellent

Don B.




The brake assemblies were not individually boxed like the last time I bought these, but thrown in a box all together where they were free to bang and scrape against each other during shipment. This resulted it the anti-corrosion coating being scraped off in many places.


I bought both side brake assemblies, a brake line kit, and an aluminum wheel/radial trailer tire combo. They came with free shipping and in great shape, in part because they were packaged so well. I still need some mounting bolts and nuts to install the brake assemblies, and the brake line kit is not long enough for my old 3500# axle trailer. In the morning I will run to NAPA, get the bolts, nuts, and brake line I need and install the brakes. I have a new hydraulic actuator/coupler a friend gave me, and that's already mounted. I hope to have pics tomorrow.

The aluminum wheel/tire combo is the 1st of 3 I need (single axle trailer plus a spare). I'm going from steel wheels with 14" tires to aluminum wheels with 15" radial trailer tires. This is a great upgrade for us, and the aluminum wheel that came today just looks fantastic. It will make the whole rig look better, as I have matching colors on the trailer and my classic tunnel hull speed boat, namely red and white.

I started buying stuff from etrailer last year when I was restoring an old travel trailer and have had great service all around. Prices are good and the people are friendly and knowledgeable. What more could I ask?

I started buying stuff from etrailer last year when I was restoring an old travel trailer and have had great service all around. Prices are good and the people are friendly and knowledgeable. What more could I ask?" />


These Titan Hydraulic 10 inch brake assemblies were direct replacements for my 30 year old Titan trailer brakes. As assemblies they simplified the order and installation process saving me time. Quality part, fast delivery and great service.


Awesome product, working very well on my trailer. Of course system is flushed with fresh water after each use.$


After 25 years of using my utility trailer, it is in need of new backing plates & brake assemblies. Your parts arrived in record time & the parts look to be perfect replacements for the road-weary rusty brake assemblies. The tail light lens also fit perfectly. Thank You for the quality products.


I have a tandem axle car carrier with surge brakes. I'm probably a typical owner and never purged the brake fluid which resulted in rust in the system and frozen wheel cylinders. Rather than just buy new wheel cylinders I bought the complete assembly (wheel cylinder, backing plate, and brakes) since to replace the wheel cylinder you have to remove the backing plate anyway. I managed to complete all four wheels, plus adjust and bleed, in about six hours. The supplied units fit perfectly. Thanks etrailer!


Exact match to my factory originals, excellent customer service and extremely knowledgeable on parts with excellent prices. Highly recommended


I replaced both left and right hand side drum brake assemblies on my Bass boat tandem trailer. It was so easy, four bolts and a brake line and I'm done. I can't believe I got new cylinder, springs, shoes, backing plate for $44 each. I'm a manufacting Engineer and I'm impressed. You guys rock.


Price was great. Fit and finish quality. Much easier than installing wheel cylinders and cleaning brake shoes.


The backing plate and brakes were great and intalled just fine. I ordered two sets of inner and outer bearings and seals. I received four sets of outer bearings so I had to hunt down inner bearings and seal locally. That was disappointing!


I purchased brakes and drum hubs. This is my second time getting many trailer parts and have had great results with everything I have gotten. I also ordered these items on a Sunday and had them at my door Wednesday with free shipping. I give etrailer two big thumbs up on product quality and processing.


Delivered well before the promise date! Brakes were easy to install and everything etrailer said they would be. Not my first order from you guys and as always, you are easy to deal with and I will be back when I need more parts for my trailers


product fit was spot on, installation was straightforward and the performance since installation, over 2500 miles of driving, has been flawless.


Seems like good quality brakes. Took a while to receive. They said it would ship in 24-48 hours but it took 3 - 4 days to ship. And two more days to receive.

I only wished that the brakes had come with bolts to attach. Now I have to some bolts that are rated for this set of brakes.

I love the fact that they are all assembled! Keeps me from screwing it up.


All the parts fit perfectly on my Shorelandr trailer


Product arrived as described was easy to install and completed a restoration of my trailer. I was impressed with the speed of delivery and would certainly order again frm etrailer

Thank you

Bring on Spring!!!!


Great price, fast shipping...product just as described. Will use ETrailer again for all my trailer supplies and needs.


product worked great. Easy to install , no hang ups , just bolt on , bleed the brake cylinder your good to go.


Item arrived on time. Packaged well. Best price by far. Saved over $100.00 compared to other vendors. Very good communication from ETrailer. ETrailer followed up and made sure I was satisfied. I will buy all of my trailer needs from them in the future.


product is what I had ordered, fit like it should. No problems with mounting.


Great product for the price. Super fast shipping. Only complaint was that item was all scratched up when I recieved it so I had to touch it up with paint to make sure it didn't rust.


Prices are reasonable, the site was friendly/helpful, and the delivery of the product was expeditious.

Mike ..


Works great

Show More Reviews

See what our Experts say about this Dexter Accessories and Parts

  • Replacing Hydraulic Brakes With Electric Drum Brakes On Trailer
    I have attached a link to a helpful article that explains what is needed to add electric drum brakes to a trailer. Your Dico brake assemblies are 10 inch by 2-1/4 inch so the part # T4423400 and # T4423500 would both work as replacements. The best way to make sure you get the right components is to pull the hub and get the bearings numbers from the side of the bearings as shown in the attached photo. If you cannot find the numbers on the bearings, I recommend using a digital caliper...
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  • Recommendation for Corrosion Resistant 10 x 2-1/4 Hydraulic Trailer Brake Assemblies
    The hydraulic drum brakes that are good for marine applications are going to be the galvanized models like # 40716 as an example. Others, like the Galphorite coated assemblies, like # T4423400, also offer excellent corrosion resistance. Any assembly that does not have a special coating and/or is not galvanized then that would indicated it is powder coated steel, like # 23-312, and is not ideal for marine applications. If you are looking for 10 x 2-1/4 assemblies for marine applications,...
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  • Replacement Brake Assembly Recommendation for 1997 MasterCraft 20 ft Boat
    Since your trailer has 10 inch by 2-1/4 inch brake assemblies currently all of the assemblies you mentioned are going to work. I would go with the sefl-adjusting part numbers # DMSB24428M and # DMSB24429M though since you mentioned you were interested in that option. The matching Titan assemblies are part # T4423500 for the left hand side and part # T4423400 for the right hand side. Based on the seal dimensions you listed the part # 168233 is the correct replacement. We don't carry...
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  • One Wheel on a Boat Trailer Locks Up and Trailer Actuator is Leaking Brake Fluid
    It sounds like you have a leak in the system either in a brake line or at the actual wheel cylinder. If this is the case, you may not have to replace the entire hub or brake assembly, just the part that is leaking. A leak can also draw air into the system and cause the brakes to lock. My theory is that it is the wheel cylinder on that one side. After you inspect the brakes and find the culprit, make sure that you bleed the braking system. There are vacuum type systems that you can use...
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  • Converting From Hydraulic Drum Brakes to Electric Brakes
    I could not find any type of photo of a Dico 15638 drum, but my understanding is they are 10" diameter x 2-1/4" wide, but if there is any potential interference with the magnet you would need to replace your hubs. If you would like to send a photo so I can take a look, please do. To add electric brakes to a 3,500 lb axle (if that is what you have) you will also need a 4-bolt Brake Mounting Flange # 4-35, a Breakaway Kit such as # 20400, wiring for your trailer as well as a brake controller...
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  • Dexter 10 x 2-1/4 Inch Brake Assembly with Different Bolt Hole Spacing
    A 10 x 2-1/4 inch brake assembly would typically be found on a 3500 lb axle, and would use a 4 bolt mounting flange whose holes are 2-7/8 inches apart on center. However, there was an exception. Before May of 2009, Dexter manufactured a 4400 lb capacity axle that used mounting flanges that had holes that were 2-13/16 inches on center. An example of those would be the # 23-454-455 Dexter Brake assemblies. That axle was kind of an oddity, I believe Dexter built that as a proprietary item...
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  • Replacement Brake Assembly Recommendation for a Dico 15638 Assembly
    Your Dico brake assemblies are 10 inch by 2-1/4 inch so the part # T4423400 and # T4423500 would both work as replacements. There is quite a bit of overlap between Titan and Dico parts.
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  • What Hubs Do I Need for the 2,200 lbs Timbren Axle-less Suspension System?
    I would be happy to help you find a set of hubs for your Timbren Axle-Less Trailer Suspension System item # ASR1THDS03. We have two options depending on whether or not you need brakes. For just the hub without brakes you will want the Trailer Idler Hub Assembly for 3,500-lb Axles - 5 on 4-1/2 - Pre-Greased item # AKIHUB-545-35-K. If you need electric brakes the Dexter Electric Trailer Brake Assembly - 10" - Right Hand item # 23-27 and Left Hand item # 23-26 will be a great choice. If...
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  • Hub & Drum and Brakes for 2,000 lb Timbren Heavy-Duty Axle-Less Trailer Suspension
    We have compatible brakes for the Timbren Heavy-Duty Axle-Less Trailer Suspension - 4" Drop Spindle - Regular Tires - 2,000 lbs # ASR2KHDS05, though they are not the Dexter 7" brakes. Instead, you would need the correct hub and drum with 10" brake assemblies: - Dexter Trailer Hub and Drum Assembly for 3,500-lb E-Z Lube Axles - 10" Diameter - 5 on 4-1/2 # 84546UC3-EZ - Electric Brakes: Dexter Electric Trailer Brake Assembly - 10" - Left Hand # 23-26 and Right Hand # 23-27 OR - Hydraulic...
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  • Are All 4 Bolt Trailer Brake Mounting Flanges the Same Bolt Pattern
    Yes, the 4 bolt mounting pattern that the Titan Galphorite Free-Backing Hydraulic Trailer Brake Assembly # T4423400 and the Demco Hydraulic Drum Brake Assembly # 40715 have is the same 4 on 4 inch bolt pattern. Basically all 4 bolt brake mounting flanges are the exact same 4 on 4 inch pattern.
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    Image 1 for
  • What is the Difference Between the 10 x 2-1/4 inch Titan Free Backing Hydraulic Drum Trailer Brakes
    The difference, other than cost, between the Titan Uni-Servo free backing Hydraulic 10 inch Trailer Brake Assemblies, # T4423400, and # T4071500, is that the # T4423400 assembly has Galphorite plating which delivers superior corrosion protection for boat trailers that are repeatedly exposed to water and sometimes salt water. Other than that these brake assemblies are constructed the same and will brake the same, the coated assembly will just last longer when used on a boat trailer.
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  • Can Titan Free-Baking Trailer Drum Brakes Be Used with Brake Actuating Couplers with Reverse Lockout
    You can use Titan Galphorite Free-Backing Hydraulic Trailer Brake Assembly, # T4423400, with a brake actuating coupler with reverse lockout provided the actuator is designed for use with drum brakes. You will be able to back up whether the reverse lockout is engaged or not because hydraulic pressure is contained by the wheel cylinder nullifying the lockout. Basically, what will happen is when you start backing up, the brakes will grab a little and then with continued backward motion they...
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  • Titan Brake Assemblies for 3500 lb Axle with 4 Bolt Flange
    The part you were asking about has been discontinued but wouldn't work for your flange. Instead, you would bolt brake assemblies like the Titan Galphorite Free-Backing Hydraulic Trailer Brake Assembly Right Hand # T4423400 and the left hand version # T4423500 to a four bolt mounting flange. The # T1544600042 that you referenced will ride on to the spindle of your trailer and will spin with the wheel assembly. It will be held to the brake assemblies that will remain stationary and bolted...
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  • Free Backing Hydraulic Trailer Brakes Not Allow Trailer To Back Up
    Basically, a free backing brake assembly like # T4423400, will have one shoe that is shorter than the other and the bracket will be a different shape. On a regular assembly, the shoes will by mirror images of each other. Also, on a free backing assembly, you would be able to back up. Also if the actuator has a reverse lockout on it, make sure it is engaged so you can back up. There are 2 types of lockout: manual and electric. A manual lockout will have a lever on the coupler that you have...
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  • Passenger Side Free Backing Brake Heating Up and Braking Problems on Trailer
    There could be a couple of things going on here but you have done well to take a look at all the parts to make sure they are in good working order. First, it is important to note that even free backing brakes require initial adjustment. TITAN Surg-O-Matic trailer brakes incorporate a back up feature that makes it necessary to rotate the wheels in the direction of forward rotation only when making adjustments. The brake adjustment nut is located behind a slot at the bottom of the backing...
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  • Recommended Trailer Brake Assemblies for 2003 Coachmen clipper
    From this and the additional information you provided (such as the casting number from your brake drums), I've found that your Coachmen Clipper uses a 7 x 1-1/4 Inch electric brake assembly. If there are wires You would want to use # 23-47 for the left side and # 23-48 for the right side. Mounting hardware is included with the assemblies You might also consider replacing your brake drums as well. Take a good look at the armature surface (the surface the brake magnet rides against) and...
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  • Can Free-Backing Trailer Brakes be Used on a Trailer with a Reverse Lock Out
    Free backing brake assemblies can be used on a trailer that has a reverse lockout. If it's a manual lockout they would allow you to back your trailer up at any given moment without having to get out and activate the lockout. As long as your hub/drums are 10 by 2-1/4 the part # T4423400 for the right hand side and part # T4423500 for the left hand side would be a great choice.
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    Image 1 for
  • Replacement Trailer Brake Drums For Dico 15638 With ST175/80R13 Wheels and Tires
    Instead of using the Hydraulic Brake Kit # AKFBBRK-35-D which requires using 14"-16" wheels you should use the Dexter Galphorite Free-Backing Hydraulic Trailer Brake Assembly Right # T4423400 and Left # T4423500. These will fit with your ST175/80R13 trailer wheels and tires.
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  • Will Titan Hydraulic Drum Trailer Brake Assemblies Fit a 1999 Jayco Pop-Up Camper
    If your 1999 Jayco trailer has 13 to 15 inch wheels and it has 10 inch by 2-1/4 inch hydraulic brakes that have a 4 on 4 mounting pattern and 3 inch diameter center hole for a 3,750 pound axle, then you will be able to use this brake assembly, # T4423400. This is the right hand side assembly. The left hand side is # T4423500. I have included a link to the installation details for you to view.
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  • Can I Re-Use DICO-15638 Hubs with New Electric Brake Assemblies?
    Some hub/drum assemblies can accept either electric or hydraulic brakes and some can only accept one or the other. It has to do with the size or in your case how the drums are cast. Some drums have uneven castings and you need a smooth inside of your drum with electric brakes so the magnets can make full contact and engage the brakes. The Titan Galphorite Free-Backing Hydraulic Trailer Brake Assembly - 10" - Right Hand item # T4423400 are 10" wide x 2-1/4" thick. The left handed ones...
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  • How To Choose the Correct Brake Assembly For Older Boat Trailer
    I am happy to help you replace the brake assemblies on your boat trailer, however brake assemblies are not trailer specific. To determine the brake assemblies that will fit your trailer, you would need to know your axle's weight capacity, the size of your wheels, your mounting flange bolt pattern and the inside diameter and depth of your hub. This particular Left Hand Titan Galphorite Free-Backing Hydraulic Trailer Brake Assembly part # T4423500 fits a 13", 14" or 15" wheel, has a 4 on...
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  • Troubleshooting Brake Bleeders that Leak Fluid Even When Tight
    Most likely what is happening is that there is a flaw in the bleeder valve and is not seating properly which is allowing the fluid to seep past valve even when tightened. They shouldn't require much torque for them to seat enough to prevent leaking so it has to be related to the design of the valve.
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  • Left and Right Hand Side Dexter 3,500 lb Galphorite Hydraulic Titan Brake Assembly Recommendation
    For the matching set you would want the part # T4423500 for the left hand side and part # T4423400 for the right hand side. The part number # T4445300 is being phased out, but the two I mentioned are the replacements for it. I attached a review video for you to check out as well.
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  • Available 6K Weld-On A-Frame Drum Brake Actuators
    Thank you for the photo of your trailer tongue and actuator coupler. The one weld-on 6K drum brake actuator we offer is the Titan Multi-fit A-Frame Actuator # T2492800. This accepts 1-7/8-inch, 2-inch and 50mm hitch balls and includes a breakaway kit. It will fit 50-degree a-frame trailers. Note that this coupler does not include a reverse lockout so it best paired with free-backing brakes like # T4423400 and # T4423500. All 6K drum brake actuators for 2-inch balls are shown on the linked...
    view full answer...
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