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Replacement Master Cylinder Assembly for Dexter Model 6 Brake Actuators - Drum
(60 reviews)
Price: $219.95
In Stock
Dexter
Replacement Master Cylinder Assembly for Dexter Model 6 Brake Actuators - Drum
Part Number: T1777401
In Stock
$219.95
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- Reviews (60)
- Q & A (0)
- Videos (1)
- Photos
Dexter Accessories and Parts - T1777401
- Brake Actuator
- Hydraulic Drum Brakes
- Master Cylinder
- Dexter
This replacement assembly fits Dexter Model 6 brake actuators for drum brakes. Orifice connector (T1209800) is sold separately.
Features:
- 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 Let’s Check Out the Replacement Master Cylinder Assembly for Dexter Model 6 Brake Actuators
Hello, everybody. This is Jeff at etrailer.com. Today, we're gonna take a look at this replacement Master Cylinder Assembly for the Dexter Model 6 Drum Brake Actuators. Now, this replacement master cylinder assembly fits Dexter Model 6 brake actuators for drum brakes. As you can see, it will include everything shown here. The master cylinder itself, the cylinder mounting plate, the push rod assembly right here, and the diaphragm type filler cap on it.
Now as we mentioned, this master cylinder is designed for use only on drum brakes, and that's because drum brakes will require a maximum pressure rating of 1,000 PSI. So the orifice opening on the inside of this master cylinder is smaller than is used on disc brakes. This one we mentioned is for drum brakes. Now, disc brake actuators will require a maximum pressure rating of 1,500 to 1,600 PSI, so because of that, the master cylinder designed for disc brakes will have a larger orifice connector opening. If you do need one for the disc brakes, we do also sell that master cylinder separately.
It's part number T1777405. And when you look at it, it'll look exactly like this one. The only difference is on the inside, it'll have the larger orifice opening for the higher pressure for disc brakes. Now to install this, the bracket is included, but the mounting hardware is not included. You can use your existing hardware you already have or if you need new hardware, we do sell that separately.
It uses a self-tapping hex bolt, 5/16 diameter by half inch long. They are part number T1781500. And again, they're sold separately and usually listed on this product page as a related product. Now also to connect your brake line to this master cylinder, it will require an oriface connector that'll connect the 1/8 inch thread here that's on the master cylinder to a 3/16 brake line fitting that's on your trailer. That orifice connector sold separately, part number T1209800, and it is also listed on this product page as a related product.
But that should do it for the review on this replacement Master Cylinder Assembly for the Dexter Model 6 Drum Brake Actuators.
Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
- Wrong item was ordered
Ratings & Reviews
4.7
60 reviews
by:
Bill D
05/10/2018
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!
Thanks for the quick delivery and reasonable pricing. It makes the purchase a great value!
by:
David
03/19/2025
Awesome service, awesome product, awesome delivery!! Will be ordering more related parts in the near future!!
Victoria H.
3/21/2025
That's AWESOME David! We'll be here and ready to help!
David
3/20/2026
Dont use the trailer all that much, but when we do, the brakes seem to work VERY well! The master cylinder was easy to install and bleed .....very happy with the product! ??
by:
Donald
02/12/2022
Perfect like for like replacement for my Military light tactical trailer.
Donald
2/12/2023
Product is working out perfectly after 1 year of use.
by:
Michael
11/01/2026
It’s a good fit
by:
EB
04/11/2025
The master cylinder on my M1101 trailer had a broken cap & filled w/ rust. This replacement master cylinder is the exact replacement part. Easy install & brakes now work perfectly. etrailer is a great place when you need replacement parts or upgrades for your trailer(s).
Victoria H.
4/12/2025
So glad to hear we had exactly what you needed to get the job done! If you need anything for your next project, we'll be happy to help :)
by:
Richard
05/29/2026
Everything fit like a glove it was an easy install
by:
Greg
07/10/2017
Works great, fixed the issue of brakes locking up on my Surge brake system, after a year of trying to adjust the brake drums.
Greg
7/10/2018
Product is working well, have not had any issues.
by:
Steven
12/15/2019
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
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
by:
Richard
03/23/2024
It took a little longer than I anticipated, but I had the option of paying extra for early receipt. My only issue was that the four mounting screws or brackets were not threaded which I ended up doing. Other than that, it’s, it’s a perfect fit and IIt took a little longer than I anticipated, but I had the option of paying extra for early receipt. My only issue was that the four mounting screws or brackets we’re not threaded which I ended up doing. Other than that, it’s, it’s a perfect fit and I have, all the confidence that it work fine.
by:
James
10/19/2025
Easy to order…. Received it sooner than expected…….. excellent to work with….
Easy install
Easy install
by:
George
09/11/2019
The product was exactly as described, it took less than 15 mins to change out the old master cylinder
Very happy with my purchase!
Very happy with my purchase!
George
9/12/2020
Its been a great year, your products are awesome, exact replacements and quality merchandise
by:
Wesley
09/20/2022
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.
by:
Mark B.
05/19/2015
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 etrailer.com for all my trailer needs.
Service/communication was excellent and delivery was prompt. I would not hesitate to use etrailer.com for all my trailer needs.
by:
Joseph
12/17/2017
Exact replacement for older trailer very easy to work with and corresponding about shipping and delivery was great thank you
by:
Patrick
05/06/2021
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.
by:
Doug R
04/25/2020
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.
by:
Paul
08/23/2022
I have always gotten quality products from etrailer. They never disappoint.
by:
Dave
07/22/2019
exactly what i ordered and needed, along with fast shipping. excellent job
by:
Shawn
03/03/2021
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.
by:
Bill B.
10/03/2014
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.
by:
Rick
06/09/2024
EAsy swap-out and installation, works well!
by:
Al B
06/25/2014
Part was ordered and received within days. Perfect fit which made for easy installation.
Thank you
Thank you
by:
Jeffery
10/03/2018
Thank you. Always great services and fast shipping!
by:
William Depew
04/19/2014
Best service I have received from anything I have ever ordered. Product arrived in only two days. Item was excellent and exactly what I needed.
by:
Ian
05/31/2022
Still working fine.
Ian
6/2/2023
After a year still working fine.
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Show More Reviews
See what our Experts say about this Dexter Accessories and Parts
- Availability Of Replacement Master Cylinder Assembly for Dexter Model 6 Brake Actuators - DiscHello Kyle, thanks for reaching out. There are different master cylinders for disc and drum brakes. The part you are looking for Replacement Master Cylinder Assembly for Dexter Model 6 Brake Actuators - Disc # T1777405. The Dexter part number is 068-072-01. Sadly, we no longer carry this part. We sold our last one over a year ago and we will not be getting more stock. If you reach out to Dexter they should be able to tell you if/how you can get one. Otherwise the only solution we can offer...
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... - Replacement Master Cylinder for 1972 Calkins Boat Trailer with Drum BrakesOut 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...
- 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...
- How to Convert a Drum Brake Actuator Titan Model 6 to a Disk ActuatorIf 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... - Are T1777405 and T1777401 the Same Master Cylinder for Titan Model 6 ActuatorsNo. 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... - Will Removing Check Valve on Master Cylinder Keep Brakes from Engaging When Backing UpRemoving 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... - Solution for Jerking Brake Application of Titan Model 6 ActuatorWhat 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... - Replacement Master Cylinder Recommendation for Titan Model 6 Drum Actuator T4079200What 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... - Bleeding Trailer Brakes and Air Bubbles Won't StopIf 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... - Can the Master Cylinder for Model 6 Drum Brake Actuators Part # T1027100 Be RebuiltThe 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 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... - Model 6 Trailer Brake Actuator Compresses but Does Not ExtendThe 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... - Troubleshooting Installation of Titan Replacement Master Cylinder Assembly T1777401Titan 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... - Comparing The Titan Master Cylinder Assemblies For Model 6 Brake ActuatorsThe 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... - Do You Carry Rebuild Kits For the Master Cylinder on a Model 6 Surge Brake Actuator? Currently we only carry the Replacement Master Cylinder Assemblies for Drum # T1777401 or Disc # T1777405 brake Model 6 surge actuators. We do not have any rebuild kits for these assemblies.
view full answer... - Replacement Master Cylinder for Titan Model 6 and 10 Brake ActuatorWe 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...
Do you have a question about this Accessories and Part?
Info for this part was:
Written by:
Lindsey S
Installed by:
Jeff D
Expert Research:
Jameson C
Updated by:
Wilson B
Updated by:
Manda E
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
William D.
5/10/2019
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.