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Replacement Master Cylinder Assembly for Dexter Model 10 and Model 20 Brake Actuators - Disc

Replacement Master Cylinder Assembly for Dexter Model 10 and Model 20 Brake Actuators - Disc

Item # T4749501042
Our Price: $170.51
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Replaces the master cylinder assembly for your Dexter Model 10 or Model 20 brake actuator. Works for disc brake applications only. For drum brake applications use T2374600 instead. 1-800-496-5010 to order Dexter accessories and parts part number T4749501042 or order online at Free expert support on all Dexter products. Great prices and Fastest Shipping for Replacement Master Cylinder Assembly for Dexter Model 10 and Model 20 Brake Actuators - Disc. Accessories and Parts reviews from real customers.
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Dexter Accessories and Parts - T4749501042

  • Brake Actuator
  • Master Cylinder Parts
  • Master Cylinder
  • Dexter
  • Disc Brakes

Replaces the master cylinder assembly for your Dexter Model 10 or Model 20 brake actuator. Works for disc brake applications only. For drum brake applications use T2374600 instead.


  • Replaces the master cylinder assembly for your Dexter Model 10 or Model 20 brake actuator
  • Works for disc brake applications only
    • For drum brake applications use T2374600 instead
  • Comes with the master cylinder and everything needed to install in your actuator including:
    • Master cylinder
    • Brass connector
    • Right-hand cylinder mounting bracket
    • Left-hand cylinder mounting bracket
    • (2) 3/8" Hex bolts
    • (2) 3/8" Hex nuts
    • (2) 3/8" Lock washers
    • Filler cap


  • All Dexter Model 10 brake actuators for disc brakes
  • All Dexter Model 20 brake actuators for disc brakes

068-095-01 Replacement Master Cylinder Assembly for Dexter Axle Model 10 and Model Brake Actuators - Disk Breaks

Replaces Titan 4749501042

Video of Replacement Master Cylinder Assembly for Dexter Model 10 and Model 20 Brake Actuators - Disc

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

Video Transcript for Titan Replacement Master Cylinder Assembly Installation

Today on our boat trailer, we'll be installing the Titan Master Cylinder Assembly, part number T4749501042. We're also going to be using a reverse lockout solenoid for hydraulic brake actuators. It is part number DM11993. Here's our master cylinder for reverse lockout solenoid already screwed into it. Your master cylinder will have a fitting like this in the back of it. You just unscrew that and you can screw your solenoid in for the reverse lockout. I will show you how to install the master cylinder real quick.

We will just slide it into the tongue of our trailer like so, making sure the push rod slides into the channel of the tongue and then we'll grab our bolts here, there are 2 on either side that it bolts to. We'll have to push in on our master cylinder a little bit in order to line up the bolt holes. Now we have these started on this side, we will do the other side the same way. Once we have all 4 bolts started, we can tighten them down. Now we can take our brake line and secure it into our lockout solenoid here. We'll tuck out the excess brake hose underneath the trailer in the channel.

We will tighten up our fitting going into the lockout solenoid for our long brake hose going back to our T fitting and we will secure our access down. We can fill our master cylinder with some fresh, clean brake fluid from an unopened container. Fill it up and re-secure our cap like so. We can open up the brake bleeder on the passenger side, because it is the furthest from the master cylinder. I want to use the top one, you always use the top brake bleeder.

I will open this up a little bit using a 7/16 wrench. Now we can start bleeding our brakes. You can take your safety chain here and give you a place to rest a 2 by 4 or metal pipe along and you can push the tongue of the trailer back into the master cylinder and we can begin the bleeding process. Pushing back on the tongue like so, and I will keep on doing this process until we have no air bubbles coming out of the bleeder screw on either caliper. Now that we've had a steady stream of fluid coming out of the passenger side, we have a screw here on the top, we'll do the same on the drivers side and once we have a steady stream of fluid coming out of that one as well, we will top off our brake fluid in the master cylinder and we will check the system for any leaks that any of the connection points where our hoses meet. If not leaks are found, our hydraulic portion of the brake system is done, so we can to ahead and put our wheels back on now at this point and time. Now that we have completely bled our brakes and checked or any leaks, we can actually hook up our reverse lockout solenoid. These wires can now block out solenoid.

We will ground one of them to the trailer frame and the one will go to the reverse wire signal from our trailer input on the electrical connector. I will take one of the wires, strip off about 1/4 inch or so and then we will take a ring terminal here and crimp it on and we will use this one as our ground wire and we'll ground it to the frame of the trailer. With that we will use a self tapping screw right here and we'll just find a place in the frame to ground it to. We got our self tapping screw and screw gun. We'll take our other wire here and hook up the reverse input of our trailer. Strip off 1/4 inch, take a weather proof butt connector here insert it and we'll crimp it down as well. The other end will go to our bi-pole or our 7 pole, whichever one we are using. This will be the input for the reverse signal. We're going to convert our trailer to a 5 hole signal here by flat. This is for bigger boat trailers. The 5 pole flat connector that we are using here for either installation of the trailer wiring is 20017. There is a blue wire here which is the signal for reverse for your trailer brake lockout solenoid. We will strip off 1/4 inch of this blue wire here and we will install it into our butt connector here that goes to our solenoid. We will crimp it into place. We can hook up the rest of our wires to where they go based upon our connection here. We will take our old connection here and cut off these zip ties to separate our wires so we can access them a little bit easier. I'm going to start with our green wire, strip it back about 1/4 of an inch. We are measuring off where we need to trim back our green wire, right about there we will cut the excess off of our green wire, strip back another 1/4 of an inch and install our butt connectors. Now we will take the brown wire for our right side and we'll do that one next and then we will do the same for the other wires. With all of our electrical connections made now, we can use our heat source, seal our heat shrink butt connectors up. To help tidy up our wires, I'm going to take some electrical tape here and wrap around our wires, just so we don't have a lot hanging down and this will make a nice clean install. Now that we've done that, we can actually go hook it up to our truck and go down to the lake and enjoy our boat. That completes the installation of the Titan Master Cylinder Assembly, part number T4749501042.

Customer Satisfaction Score:

Customer Reviews

Replacement Master Cylinder Assembly for Dexter Model 10 and Model 20 Brake Actuators - Disc - T4749501042

Average Customer Rating:  4.9 out of 5 stars   (38 Customer Reviews)

Replaces the master cylinder assembly for your Dexter Model 10 or Model 20 brake actuator. Works for disc brake applications only. For drum brake applications use T2374600 instead.


It was exactly what I needed and I received it a day early


Wow, the packaging was the worst I have ever seen... Were they trying to be funny? A master cylinder just bouncing around in a box with the 2 grease seals, nothing protected with packaging, just rattling around in there. Lucky for me the parts in the box, and poking through the side of the box when it arriver were all ok. Glad I was in a good mood, I found it funny this time.


I recently purchased a master cylinder assy for my boat trailer. After receiving the part I noticed there was not a brass adapter fitting in the back of the master cylinder as shown in the picture and clearly stated in the product description that this part was included. I removed the brass brake line fitting from the old part but it was the wrong size. I called etrailer and spoke to Carol. It was a weekend so I was surprised someone answered the phone. Bottom line is Carol took care of me and within a few days the part showed up and the master cylinder is now alive and well where it needs to be....on my trailer. Thanks Carol....GREAT JOB


As always the part came in a reasonably short time "FREE SHIPPING" and again as always just what I needed, I have bought just the master cylinder in the past from my local trailer parts dealer and it didn't come with a new boot or a new cap...etc. and by the time I removed, cleaned and transferred the spring assembly and mounting brackets I had way to much time invested in my project. Today it took not even 5 min to install this part to my hitch and it fit perfect. I truly believe that is the only way to go for any of your trailer needs.

Jim Andersen of Ace Marine, Norther Calif


Did a complete rebuild of trailer brakes that were just blocks of rust. Couldn’t have done it without the etrailer videos and OEM replacement parts. The Titan actuator fit perfectly, works great.


Exact fit. Works beautifully as it should. Brand new is a wonderful thing on an old crusty trailer. Great price...speedy shipping....can you ask for more?
Highly recommended. Thanks etrailer

After a year gone by everything works fine as it supposed to.Iam very happy with my trailer.Thank you etrailer
ANDRAS C - 06/18/2018


Thank you to all at e-trailer and thank you for the master cylinder I ordered and a nice thank you to Wayne for calling back a message to me. I used a reverse bleeder and pushed the fluid from the calipers and got rid of the dirty fluid just before master then blead the master and soon I had four wheels braking nicely.
Thanks to all of you for making our vacation safer towing the boat.


Repalcement Part for a Titan model 20. Exactly as advertised

It was a replacement brake cylinder. Installed easily. Brakes now work as good as new. There have been no issues.
-- comment by: Edward - 02/14/2014


Placed order and got a phone call within 2 hours that the part was on back order and they offered alternatives. Was told part would be available in 2 weeks. 4 days later part was in and shipped. Great communication from ETrailer!


The product pictured matched my old unit exactly. Received item in a reasonable time. Was able to install the new unit with no problems. I need to complete reworking the rest of the brake system before I can test but so far everything looks great.


as normal every order has been correct, quality parts, great prices and fast service. Have always enjoyed working with E-trailer.
Thanks for being there when I need parts.


Just got back from a fishing trip, 4 hr ride one way from home. New master cylinder worked like a champ. Perfect replacement.


As advertised, great price, direct replacement, Super fast shipping, great and prompt customer service. Will be an E-trailer Advocate.


I am very happy with my order Everything was correct and I received it in a very good timely manner. Thank you Lisa for getting the master cylinder and selinoid to me that quick It was ordered late Thursday and got it on Monday and back together and ready to go fishing. Again thanks


The master cylinder shipped very quickly and was just what i needed. Installed easily. I will definately purchase from you again.


Products arrived quickly. Heather at customer service was great to deal with (item was backordered). Will definitely buy from here again


Perfect fit, work's like a new trailer!


Exact replacement, perfect fit, fast shipping. Great company to work with.


Very helpful staff, fast shipping, A1 Master cylinder!


Quick and easy advice, fast shipping that actually arrives on time and amazing customer service with great follow up.



good just as expected
clasea - 08/19/2015



Package came on time and was exactly what I expected.



Everything fits just perfect and exactly what I needed

Show More Reviews

See what our Experts say about this Dexter Accessories and Parts

  • Replacement Master Cylinder For Tandem Axle Boat trailer With 10,000 Lb Capacity
    To replace the master cylinder on your tandem boat trailer you will need to know a couple of things. Since there can be no guarantee of a fit you will need to let me know the make of the master cylinder you currently have. Also, are you using disc or drum brakes on you trailer. You would not want to use a disc brake master cylinder with drum brakes because the psi rating is much higher for disc brakes. Using it on drum brakes can lead to damage to the wheel cylinders and very aggressive...
    view full answer...
  • Can a Titan Model 10 Actuator for Drum Brakes be Converted to Disc Brakes
    Yes, you can swap out the master cylinder of your Titan model 10 actuator to the part # T4749501042 that you referenced so that it would operate a set of disc trailer brakes.
    view full answer...
  • Troubleshooting Master Cylinder T4749501042 Not Releasing Fluid When Installed on My Trailer
    Sounds like there could be a few things happening. Your coupler could not be depressing the piston of the master cylinder, your coupler has an electric lockout, or the master cylinder is bad. Let's start with checking the coupler to make sure its getting enough pressure to the master cylinder piston, I recommend taking your safety chains from the trailer around the coupler and hook them up closely to the hitch of your vehicle, this way you will be able to use about a 4 foot 2x4 board...
    view full answer...
  • Titan 20k Surg-o-matic Coupler Disc Brake Conversion
    For your 20K coupler, the Replacement Master Cylinder Assembly for Titan Model 10 and Model 20 Brake Actuators - Disc # T4749501042 is the fit for your Surg-o-matic coupler.
    view full answer...
  • Replacement Master Cylinder for Titan Model 20 Actuator
    Go ahead and email me back with the picture of what you have and I can see if we can help. Worst case scenario you'd have to replace the coupler.
    view full answer...
    Image 1 for
  • Will the Replacement Master Cylinder Assembly # T4749501042 Work on a Cronkhite Trailer
    If the master cylinder from your brake actuator on your Cronkhite trailer has the numbers 23744 stamped on the side, then it probably uses a Titan model 10 or model 20 brake actuator. To ensure that you select the correct replacement master cylinder assembly, we will need to know if your trailer has disc brakes or drum brakes. If your trailer has disc brakes, then you will need the replacement master cylinder assembly, # T4749501042, that you referenced. If your trailer has drum brakes,...
    view full answer...
  • Will Titan Master Cylinder Assembly Fit Dico Hydraulic Brake Actuator
    If your Dico Actuator is a model 10 or 20 and is designed for disc brakes then part # T4749501042 will work well for you. If you have drum brakes, and have model 10 or 20, then the replacement master cylinder you need is part # T2374600.
    view full answer...
  • Can a Titan Model 10 Actuator for Drum Brakes be Used with Disc Brakes
    The part # T2478100 is indeed designed for use on trailers with drum brakes. The master cylinder of the actuator is designed for lower pressure drum brakes. What you can do is swap out the master cylinder of the actuator with the part # T4749501042 and it would be compatible with disc brakes.
    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 disc...
    view full answer...
  • Troubleshooting Disc Brake Performance on a 12,000lb Boat Trailer
    There are a few things that can cause your brakes to not lock up, but you should be able to get them to lock when braking hard. Some of the most common causes are: There is air or grime in the lines The brake pads are dirty or have grease on them The disc brakes are brand new and haven't had a chance to seat properly into the brake pad or If the disc brakes were a recent upgrade and not original to the trailer it is possible that the brake actuator still has a drum master cylinder in it,...
    view full answer...
  • Can Titan Model 10 Actuator be Converted to Disk Brakes from Drum
    Since you have a Titan Model 10 actuator for drum brakes you can convert them to disc. You can swap out the master cylinder of your Titan model 10 actuator to the part # T4749501042 and you would have a disc brake setup. Now to determine the rest of the parts needed requires a bit more information. We need to find the hubs that will fit the spindles of your trailer. I attached a help article that will walk you through that process.
    view full answer...
  • Replacement Actuator For Disc Brakes On Triple Axle Boat Trailer
    The Titan Replacement Master Cylinder Assembly for Titan Model 10 and Model 20 Brake Actuators - Disc, # T4749501042 will work with disc brakes if you are looking to rebuild your actuating coupler. The Dico Master Cylinder 23744 is only compatible with drum brakes. If you are looking to replace it you will want the Titan Zinc-Plated Brake Actuator w/ Drop, Lockout Shield - Disc - 2-5/16" Ball - 12,500 lbs # T4750620 also made for disc brake application. You do want to ensure you get...
    view full answer...
  • Orifice Connector For Old Style Titan T20
    What you have in the photo is the older 068-351-00 orifice connector with your Titan T20. Those connectors are obsolete and are not even available through Titan (now Dexter) any longer. The only other option is to replace the master cylinder completely in the older T20 using the part # T4749501042 if you have disc brakes or part # T2374600 for drum brakes which come with the a new connector.
    view full answer...
    Image 1 for
  • Replacement Master Cylinder for Titan Model 10 or Model 20 Actuator
    The easiest way would be to know the part number, but if you need a master cylinder replacement you actually don't need to know if your Titan actuator is a Model 10 or Model 20 because the master cylinder replacements we carry can be used for either. If you have a drum brake actuator you would need the Replacement Master Cylinder Assembly for Titan Model 10 and Model 20 Brake Actuators # T2374600. If you have a disc brake actuator you would need the Replacement Master Cylinder Assembly...
    view full answer...
  • How to Modify Drum Brake Actuator Coupler for Use with Disc Brakes
    Brake fluid pressure requirements for disc and drum brakes are too different to allow use of a disc actuator on drum brakes. Disc brakes typically need 1500-psi while drums need about 1000-psi. Brake proportioning valves do exist but we do not sell them. From a safety standpoint we do not like to recommend using a device like that. We always recommend using the appropriate actuator for the type of brakes on the trailer. Some actuators can take either drum-brake-pressure master cylinders...
    view full answer...
  • Does The Master Cylinder Assembly Need Removed Before Welding Actuator # T4830300?
    I do recommend removing the Master Cylinder Assembly # T4749501042 from the Dexter Brake Actuator # T4830300 before welding it in place. This will ensure you do not melt the inner boot on the front of the master cylinder. This assembly is only held in place by 4 bolts and removes easily.
    view full answer...
  • Can Drum Brake Actuator Be Used Temporarily on Trailer with Disc Brakes
    The problem with using a drum brake actuator with disc brakes is that it's not going to supply enough pressure to fully engage the assemblies. Drum brake actuators typically put out around 1,000 to 1,200 psi (sufficient for drum brake assemblies) but disc brake systems require around 1,600 psi, thus an actuator specifically designed for them. Because of this your braking power is going to be greatly reduced with your current setup. With a tandem axle trailer this could cause some issues,...
    view full answer...
  • Troubleshooting Titan Surge Disc Brake Actuator
    It could be that your reverse lockout solenoid needs replacement. Part # T4748800 is the replacement part. But I suspect your master cylinder is the cause for the brakes staying locked up until you release the pressure from the bleed valve on one of the calipers. You can check your master cylinder to see if the piston returns to its normal position after you manually compress it. If not you will want to replace it with part # T4747100 which fits the model 10 disc actuator. For the same...
    view full answer...
  • Can Titan Model 10 Drum Brake Actuator be Converted to Disk Brakes
    If you have a Titan Model 10 actuator for drum brakes you can convert them to disc. You can swap out the master cylinder of your Titan model 10 actuator to the part # T4749501042 and you would have a disc brake setup. For a lockout solenoid you would then want the part # T4748800. I attached a help article on adding disk brakes to a trailer as well.
    view full answer...
    Image 1 for
  • Disc Master Cylinder and Reverse Lock Out Recommendation for Titan Model 20 Actuator
    To convert your Model 20 actuator to work with disc brakes only requires the master cylinder to be changed to the part # T4749501042. Then for an electric reverse lock out solenoid all you need is the part # T4748800 and your set.
    view full answer...
  • Replacement Master Cylinder for Titan Model 10 Actuator
    What is the brand and model of actuator?
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  • Replacement Master Cylinder, Bearings, and Tires for Tandem Axle Trailer for 23 Cuddy Cabin Boat
    It sounds like your new boat trailer hasn't been taken care of and you want an estimate on cost to get up and running. Unfortunately, it isn't easy to give you anything tangible without more information. The cost of your tires, bearings, and master cylinder will depend on what is actually on your trailer. The brand of coupler and model will determine the master cylinder needed. The size of the tires will be a big determining factor, and the bearing sizing is very important as the wrong...
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    Image 1 for
  • Replacing the Master Cylinder on a Model 10 Titan Actuator with Rear Access Blocked
    Yes, you can replace the master cylinder of the Titan 10 Actuator by removing the inter slide. Removing all the parts in front of the master cylinder will be quite tedious. It may be easier to cut off the jack and replace it with a bolt on frame jack like # F1413140334. This will allow you access to the rear of the actuator to replace the master cylinder for disc brakes with # T4747100 or if you wanted one with the frame assembly # T4749501042.
    view full answer...
    Image 1 for
  • Do Brake Actuator Master Cylinders Have Weight Capacities
    The weight capacity is determined by the actuating coupler itself, and not just the master cylinder. Master cylinders are specific to the actuator models. Most of the Model 10 couplers have a weight capacity of 12500 lbs. If you are looking for a replacement master cylinder for your Model 10 actuator, we do offer the replacement master cylinder for drum brakes, part # T2374400. We also offer a replacement master cylinder for a disc brake Model 10 actuator. That part number is # T4749501042....
    view full answer...

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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee John H
Expert Research:
John H
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Manda E
Updated by:
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Employee Brent H
Installed by:
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