Demco offers a heavy-duty A-Frame Coupler for your trailer with a 2-5/16" ball size. Its primed finish adds a stylish touch to your setup.

Demco Brake Actuator Couplers

Demco's brake actuator couplers, for disc or drum brakes, have capacities up to 10,000 lbs. They feature either bolt- or weld-on applications and will make sure that you are towing safely.

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Accessories and Parts

Trailer Brakes

Trailer Coupler

Demco Reviews and Installation Videos

Review of Demco Galvanized 10" Left Hand Trailer Brakes

Review of Demco Galvanized 10

Review of Demco Galvanized 10" Right Hand Trailer Brakes

Expert Answers about Demco

Mounting Drum Brakes to an EZ-Loader Trailer with 4-Bolt Brake Mounting Flange
If you are wanting to install your brakes on your EZ-Loader trailer, you will need brake mounting flanges with a 4 bolt pattern that matches the bolt pattern of your brake assemblies. We do carry some brake mounting flanges, but we will need to know the diameter of your axle or spindle shaft to determine if we have a brake mounting flange that will fit your trailer. The brake mounting flanges will need to be welded on square, so we recommend having a qualified professional with trailer exper
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Why Do Demco Hydraulic Brake Assemblies Have Brake Linings Riveted to the Brake Shoes
Riveting the linings on brake shoes on hydraulic brake assemblies was historically the industry standard, while electric brake assemblies typically have the pads glued or bonded into place. All Demco could tell me is that they rivet all of their brake linings. I also spoke with folks at Dexter. I was told that in the past the adhesives used to bond the linings on the shoes were unable to withstand harsh marine environments. If water should penetrate between the shoe and the lining, rust can o
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What are the Measurements for the Demco Actuator Replacement Shock # DS12426
Presumably, the model number of the actuator will be stamped into the metal of the casing. This can wear down and/or get painted over after many years of service. If you cannot locate the make and model on your actuator, you may be able to go by the measurements. I went out to the warehouse and measured replacement shock # DS12426. The overall diameter is 1.662 inches (about 1-11/16 inches). The larger eye has an inner diameter of 0.89 inches (about 7/8 inches). The smaller eye has an inner
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What are the Correct Replacement Wheel Cylinders for Demco Hydraulic Trailer Brakes # 40716
If you have Redline brakes (part # 40716 is actually Demco), then you will need to use Redline Wheel Cylinder, # BP17-030 (left) and # BP17-020 (right). The correct replacement wheel cylinder for your hydraulic trailer brake assemblies is determined by the brand and size of brake assembly that is on your trailer.
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Correct Mounting Bolts and Hardware for Galvanized 10 Inch Marine Trailer Brake Assembly 40716
The 10 inch brake assembly, # 40716, does not come with mounting bolts. You would need bolts like # 7-75 to mount the assembly to the brake mounting flange. For matching washers, use # 5-8 and for nuts # 6-17.
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Mounting Hardware Recommendations for a Brake Assembly # 18787
You will need to provide the mounting hardware to install the Brake Assembly # 18787. For bolts you will want Brake Mounting Bolt # 7-75 For locking washers you will want a Lockwasher for Brake Mounting Bolt # 5-8 For nuts you will want a Nut for Brake Mounting Bolt # 6-17 I also attached a video of a brake assembly being installed for you to check out also.
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Trailer Brakes Dragging on Downhill Runs with a Demco Disc Brake Actuator
The first thing you should check is the brake adjustment on the brakes themselves. If they are improperly adjusted, readjustment could solve the issue. We have a video detailing how to adjust trailer brakes, check out the 4 minute 30 second mark in the video attached below. You should also check the breakaway lever, to be sure it is not partially activated. The next thing to check is the coupler capacity and the gross weight of the trailer the coupler is mounted on. If the trailer weight
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What is the Weight Capacity of Demco A-Frame Trailer Coupler, # 12660-97SP
The Demco A-Frame Trailer Coupler, # 12660-97SP, has a weight capacity of 21,000 pounds. This coupler is the highest rated A-Frame coupler for a 2-5/16 inch ball that we carry. Otherwise, we have some flat plate couplers capable of 25,000 pounds such as # BD4425000317 and # FC25.
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Recommendation for Installation of a Brake Mounting Flange on a Trailer Spindle and Axle
Welding a mounting flange, possible item # 4-35, is a very precise installation. The flanges need to be installed square and concentric to the hub and drum assembly and each other. If the flange is installed incorrectly rapid brake lining wear, improper braking, trailer dog legging, bearing failure, rapid tire wear and, worst of all, weakening of the axle can occur. Usually special jigs are used to install the flange. The jig will keep the flange square and concentric to the axle and spindle
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How To Reverse Without Trailer Brakes Locking When Using Demco Actuator Coupler, # DA9150-2HBC
The Demco Actuator, # DA9150-2HBC, does not have a reverse lockout feature so you would need hydraulic free-baking drum brakes on the trailer in order to back up without actuating the brakes. I have included a link to all of the free-backing brakes for you to view.
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Can a Weld-On A-Frame Trailer Coupler be Bolted On Instead of Welded
The A-frame couplers we carry, like # 12660-97SP, are weld-on applications and cannot be bolted on to a trailer frame. Any welding should be done by a qualified welder in a shop that works on trailers. The coupler you have reference accepts a 2-5/16 inch diameter ball. I have included a link to all of the A-frame coupler options for you to view.
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Coupler Lock Recommendation for use on a Coupler that has a 5 inch Wide Flange
It looks like would need to get a latch coupler lock like a Master Lock Adjustable Trailer Coupler Lock - Stainless Steel, part # 2847DAT, for your Four Winns trailer that has a 5 inch wide flange. I attached a link to a review video of this coupler lock for you to check out. We do not have a surround coupler lock that will be wide enough to fit on a coupler that has a distance of 5 inches across.
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What Information is Need to Find Parts to Switch from Hydraulic to Electric Drum Brakes
We would need to know how big the current brakes are. 10x2-1/4 or 12x2 etc. Sometimes you can re-use the drums from hydraulic brakes for electric brakes, sometimes not. If you are going to go ahead and replace the drums, we would need to know inner and outer bearing numbers. These are stamped right on the bearings. We would also need the bolt pattern of the drums. I have added a link to a wheel page that shows you how to measure bolt pattern at the bottom. Wheel diameter is important as well,
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Installing Hydraulic Trailer Brakes on a Kristi Utility Trailer
There are two ways to go. Drum brakes and Disc brakes. To determine which assemblies will fit on your spindles we will need to know the inner and outer bearing and seal part numbers. We will also need the Brake Mounting Flange bolt pattern on the spindles and the bolt pattern and size of the wheels that are on your trailer. For the hydraulic actuator we will need the size of the trailer tongue where the actuator will mount. If you will get back to me with your choices and the needed informati
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How To Check if Trailer Surge Brakes Are Working Properly On Tandem Axle Boat Trailer
Checking the brakes can be done in two ways. The easiest way is to raise one side of the trailer and spin the wheels while someone applies the surge brakes at the coupler. The better way would be to remove each of the wheels and brake drums and activate the brakes while making sure the wheel cylinders and brake assemblies are functioning properly. After this the first thing I would do is bleed the brakes using the trailers surge coupler to force the fluid from the brake lines and make sure th
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Availability of Brake Actuator Coupler Replacement Nylon Wear Pads
We do have replacement pads for the actuator you were looking at. The pads are part # 10966 for the bottom side and part # 10965 for the top wear pad. They are meant to fit the Demco D10 actuators. If you can write back with a part or model number of your actuator, I may be able to find replacement parts for it.
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What Braking Assemblies do I Need for Karavan Tandem Axle
If the bolt pattern on your axles, for the backing plate, is 2-3/4 inch on center , both of these braking assemblies would fit your 10 inch x 2-1/4 inch trailer brake assemblies. Part # 40715 and # 40716 are what I would recommend. These are the left and right hand side brake assemblies. Since you are going to be backing up an incline you want the least amount of reverse braking which is why I recommend these over the other. The shoes for these assemblies are part # BP04-126. The part incl
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Advice for Reomving Deteriorated Master Brake Clinder Cap on Hydraulic Brake Coupler
The challenge here is to keep the remains of the cap in one piece long enough to remove it. I would suggest mixing up some 2 part epoxy and coating the cap with it. If you are careful to avoid getting the epoxy down into the threaded portion of the cap, once it cures you should be able to get the cap off. If you should get pieces of the cap into the master cylinder, most hydraulic couplers are set up so that the master cylinder is removable, you could remove it if needed and clean it out.
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Bolt Pattern Size on Galvanized Marine Brake Assembly 18787
The backing plate bolt pattern is 2-7/8 inches on center both ways (square). If we can help further let us know.
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