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Replacement Master Cylinder Assembly for Dexter Model 6 Brake Actuators - Drum

Replacement Master Cylinder Assembly for Dexter Model 6 Brake Actuators - Drum

Item # T1777401
Our Price: $160.99
You Save: $54.46
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Shipping Weight: 5 lbs
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This replacement assembly fits Dexter Model 6 brake actuators for drum brakes. Orifice connector (T1209800) is sold separately. 1-800-940-8924 to order Dexter accessories and parts part number T1777401 or order online at Free expert support on all Dexter products. Great prices and Fastest Shipping for Replacement Master Cylinder Assembly for Dexter Model 6 Brake Actuators - Drum. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (42)
  • Q & A (0)
  • Videos (1)
  • Photos
  • Why etrailer?

Dexter Accessories and Parts - T1777401

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

This replacement assembly fits Dexter Model 6 brake actuators for drum brakes. Orifice connector (T1209800) is sold separately.


  • Works with Dexter Model 6 brake actuators
    • Drum brake models only
    • If using a threaded hex bolt on this application, it can be used as a self-tapping bolt
      • Self-tapping hex bolt 5/16" x 1/2" (T1781500) sold separately
  • Includes:
    • Master cylinder
    • Cylinder mounting plate
    • Hex bolt: 5" long x 3/8" diameter
    • Push rod assembly
    • Hex nut: 3/8" diameter
    • Washer: 3/8" diameter
    • Spring
    • Orifice connector opening: 0.015"
    • Diaphragm master cylinder cap
  • Orifice connector (T1209800) is sold separately

068-072-00 Dexter Axle Model 6 Master Cylinder Kit - Drum

Replaces Titan 1777401

Video of Replacement Master Cylinder Assembly for Dexter Model 6 Brake Actuators - Drum

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

Video Transcript for Titan Brake Actuator T1777401 Review

Speaker 1: Today, we're going to take a look at the replacement master cylinder assembly for the Titan Model 6 Drum Brake Actuators. Now, this is a replacement master cylinder for a Model 6 Drum Brake Actuator manufactured by Titan or Dico. It fits all the Titan-Dico Model 6 Surge Brake Couplers, and its master cylinder is designed to work with drum brakes. It's an easy bolt-on installation for replacing your old, worn out master cylinder.Now, when you do install this, you can use your existing bolts to install it or we do sell self-tapping hex bolts separately, part number T17821500. We do list them on this product page as a related product. This does come with everything shown here, comes with the master cylinder, the cylinder mounting plate, the rubber boot right here and the push rod assembly, the dual-springs with the brackets and the nice diaphragm cap that you'll remove to put in your brake fluid.That should do it for the review on the replacement master cylinder assembly for the Titan Model 6 Drum Brake Actuators..

Customer Satisfaction Score:

Customer Reviews

Replacement Master Cylinder Assembly for Dexter Model 6 Brake Actuators - Drum - T1777401

Average Customer Rating:  4.8 out of 5 stars   (42 Customer Reviews)

This replacement assembly fits Dexter Model 6 brake actuators for drum brakes. Orifice connector (T1209800) is sold separately.


Here's a couple of pictures of the master cylinder that I purchased from etrailer installed on my boat trailer. One shows the new master cylinder installed with the old one sitting next to it for comparison. The other picture is just the new master cylinder installed without the sheet metal cover in place. I will be writing a review soon.

Thanks for the quick delivery and reasonable pricing. It makes the purchase a great value!

Its been a year since I installed the new master cylinder on my boat trailer. Just pulled the boat home from storage a couple of days ago and it is still working great.
William D - 05/10/2019


Perfect like for like replacement for my Military light tactical trailer.


This MC worked very well on my 86 Dico Toybox. I did have to swap out the mounting plate with the old one because it was slightly different, but that only took a few moments and then everything bolted up just fine. Held up for the rest of the life of the trailer, about 2000 miles of hard driving.


I have always gotten quality products from etrailer. They never disappoint.


I have never seen a package wrapped so good. Thank you.


Just replaced master cylinder on 1997 EZ Loader 7000 lb boat trailer. This master cylinder looks same as old one. The casting on the lid threads were so rough I had to file the casting bumps off so lid would screw on better on the threads. It was so rough I couldn't hardly get lid off once I tightened it up. Tempted to use old lid. It was harder better material.
Where the master cylinder screw on to bracket I tapped the holes with 5/16 -18 tap. Use a starter tap or you will start in crooked. The old one was already threaded. I suggest you start your brake line to cylinder before you bolt it on. The short metal brake line will be hard to start otherwise. When you put your brake away lever on make sure you have it in front of the cylinder push block. It's a bit fussy holding the clip, lever and bracket to keep it in front. When you install shock extend it all the way out. Hook it in back. Make sure you have it lined to with spacer rollers on each side. Also make sure .875 pin goes through all three pieces inside. The rest is easy.
I have speed bleeders. I bled it but haven't tested out brakes yet. Hope I have brakes. Hope this helps someone else


Still working fine.


product was perfect repalcement for worn out surge master cylinder.


Works great, fixed the issue of brakes locking up on my Surge brake system, after a year of trying to adjust the brake drums.

Product is working well, have not had any issues.
Greg - 07/10/2018


Product arrived as shown. Although i haven't installed it yet, it appears to be a direct replacement, exactly as described. Will provide more info once i install the part.

Service/communication was excellent and delivery was prompt. I would not hesitate to use for all my trailer needs.


The product was exactly as described, it took less than 15 mins to change out the old master cylinder
Very happy with my purchase!

Its been a great year, your products are awesome, exact replacements and quality merchandise
George - 09/12/2020


I had some trouble with small debris in the small fluid path of the unit. After much flushing and blowing the master cylinder works fine.


Great experience properly identifying the part i needed, ordering process was smooth, ship time was as promised, and I received the correct item. I will use your service again if/when I am in need again.


Exact replacement for older trailer very easy to work with and corresponding about shipping and delivery was great thank you


Hi, I received the product yesterday. I have not installed and tested it yet. It may be some time, however, I can say that the online setup explained everything clearly, the pictures and description were helpful, questions were answered quickly when I called, and the representative was very customer oriented.


I ordered this master cylinder assembly to replace a rusted on. It took almost 15 minutes to install at most. Easy to order and quick delivery.


The service was excellent! Tank you!


Part was just what I needed, and at a great price too. The web site is easy to navigate and the tracking page was very helpful.


Part was ordered and received within days. Perfect fit which made for easy installation.

Thank you


Got my stuff fast and it looks like quality parts. Beat the prices of the local brick and mortar shops by a huge margin ! Paid almost half as much


It showed up on time, fit perfectly and was priced right. Thanks


A fair price for a good product.


Good product. Delivered on time. No hassle. Pleasure to do business.


Quality part worked out great would buy another when needed


simple to order. great price and got it right away

Show More Reviews

See what our Experts say about this Dexter Accessories and Parts

  • How to Convert a Drum Brake Actuator Titan Model 6 to a Disk Actuator
    If you remove or puncture the metal check valve from your current master cylinder you will essentially have a disc brake master cylinder. What you will need to do is remove the large snap ring from the front of your actuator where the brake line attaches, pull the spring out, and at the end of the spring there will be a metal check valve. If you remove that check valve and reassemble the brake assembly without it you will be ready to use disc brakes. Or a less invasive way is to puncture...
    view full answer...
  • Replacement Master Cylinder Recommendation for Titan Model 6 Drum Actuator T4079200
    What would be the easiest solution would be to just replace the master cylinder of the part # T4079200. For that you would want the master cylinder part # T1777401.
    view full answer...
  • Solution for Jerking Brake Application of Titan Model 6 Actuator
    What you described sounds like a bad shock in the Titan model 6 actuator you have. For a replacement you would want the part # T1242600 which is a confirmed fit. Actuators shocks are designed to slow the movement of the actuator so that you don't experience the jerking that you described. When they go back they allow the actuator to move too quickly which causes what you described.
    view full answer...
  • Comparing The Titan Master Cylinder Assemblies For Model 6 Brake Actuators
    The difference between the Replacement Master Cylinder Assembly for Titan Model 6 Brake Actuators - Drum # T1777401 and the Replacement Master Cylinder Assembly for Titan Model 6 Brake Actuators - Disc # T1777405 is psi compatibility. The master cylinder for disc brakes requires 1600 psi for proper function. Drum brakes only require 1000 psi.
    view full answer...
  • Can the Master Cylinder for Model 6 Drum Brake Actuators Part # T1027100 Be Rebuilt
    The Master Cylinder for Model 6 Drum Brake Actuators part # T1027100 has very few replaceable components therefore a rebuild kit is not available. If you are looking to rebuild the entire actuator then I recommend using the Replacement Master Cylinder Assembly part # T1777401 as it comes with the same master cylinder listed above in addition to the mounting plate, push rod assembly, and a few other components. If you need any specific replacement parts then please let me know and I would...
    view full answer...
  • Replacement Master Cylinder for 1972 Calkins Boat Trailer with Drum Brakes
    Out of the available options it does appear that the Model 6 actuator's master cylinders, # T1027100 or # T1777401, are the best and pretty much only options for you. On your master cylinder that additional fitting could be a port for a reverse lockout but either way the new one will not have that on it. We have a few individual parts for some master cylinders but no rebuild kit for the Model 6.
    view full answer...
    Image 1 for
  • Replacement Master Cylinder for Titan Model 6 and 10 Brake Actuator
    We have the exact part you are looking for depending on the model you need. For Titan Model 6 master cylinders, we have the Replacement Master Cylinder Assembly for Titan Model 6 Brake Actuators - Drum # T1777401. If you are in need of the Titan Model 10 master cylinder we have the Replacement Master Cylinder Assembly for Titan Model 10 and Model 20 Brake Actuators - Drum # T2374600.
    view full answer...
  • Replacement Master Cylinder for Titan Model 6 Brake Actuator
    We do indeed have the replacement master cylinder for your Titan Model 6 Drum Brake Actuator available with part # T1777401. If you happen to need the disc brake model the correct part is # T1777405, I have attached a short video review that you can check out as well.
    view full answer...
  • Replacement Master Cylinder with 2 Plungers for 2005 Ranger Boat Trailer
    It sounds like you might have the master cylinder for the Titan Model 6 Brake Actuator, either part # T1777401 for Drum or # T1777405 for Disc. This particular master cylinder features two springs, one on each side, that assist with pulling the bracket and plunger back into position when applying the brakes. If this does not look like what you have please feel free to email me a picture directly and I will be happy to take a look. You might also try and locate a part number somewhere...
    view full answer...
  • Are T1777405 and T1777401 the Same Master Cylinder for Titan Model 6 Actuators
    No. The Replacement Master Cylinder Assembly for Titan Model 6 Brake Actuators - Disc # T1777405 and Replacement Master Cylinder Assembly for Titan Model 6 Brake Actuators - Drum # T1777401 are two different parts. Disc brakes require a higher pressurization to actuate than drum brakes do, so it's likely they may look the same but the pressurized components are rated differently. If you have a disc brake actuator then you'll want to use the specific # T1777405.
    view full answer...
  • Model 6 Trailer Brake Actuator Compresses but Does Not Extend
    The shock should compress when force is applied but then extended out again when no force is on it. It sounds like you have identified a faulty component. There may also be some debris that is causing it to not extend back out but given that the unit was used it is probably in need of replacement. Chances are that other components are equally as worn so I would look closely at the master cylinder as well. If it is in need of replacement then use # T1777401 for drum brakes or # T1777405...
    view full answer...
  • Do I Clean Or Replace The Master Cylinder on a Titan Model 6 Actuator That is Full of Rust?
    I would start by checking the condition of the Master Cylinder # T1777401 on your trailer. Using the manual activation method which I have included a image for you to understand this will check to see if the O-rings inside your master cylinder have become damaged from the rust/corrosion inside the master cylinder. If you can apply manual pressure to the brakes and the board stays in the same place with equal pressure then you will be able to clean and reuse your current cylinder. If the...
    view full answer...
    Image 1 for
  • Troubleshooting Installation of Titan Replacement Master Cylinder Assembly T1777401
    Titan Replacement Master Cylinder Assembly # T1777401 for their model 6 drum brake actuator is shown in the linked review video. If you watch the video you'll see that when our reviewer handles the master cylinder the push rod assembly only travels a very small distance, perhaps 1/4-inch. If you have bled all air from the reservoir, lines and brake assemblies themselves and you do not have hydraulic pressure reaching the brakes I suggest you check that the system is filled with the recommended...
    view full answer...
  • Bleeding Trailer Brakes and Air Bubbles Won't Stop
    If the air bubbles aren't ever stopping that indicates that air is getting introduced into the brake lines. Most likely through a bad master cylinder but since we know yours is a new part # T1777401 that would make me think that most likely you are leaving the bleeder open before releasing the master cylinder which is basically allowing the lines to suck air back in. Pressurize the system, open the valve, close the valve, release pressure.
    view full answer...
  • Will Removing Check Valve on Master Cylinder Keep Brakes from Engaging When Backing Up
    Removing the check valve from the master cylinder for hydraulic drum brakes, like part # T1777401, enables it to put out a greater psi rating so that it will be compatible with hydraulic disc brakes that require the higher psi rating. If you are mechanically inclined and you carefully reassemble the master cylinder then you can remove the check valve. However, if you are less mechanically inclined then it would be better to replace the drum master cylinder with a disc master cylinder,...
    view full answer...

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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee Manda E
Updated by:
Manda E

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