Disc Brakes Do Not Appear To Be Working Properly On Tandem Boat Trailer With Surge Coupler
Question:
Hi, I have a 2010 dual axle ez loader with kodiac disc brakes. It carries a 21foot triumph center console ocean boat. If I recall correctly the mechanical actuator in the past would never completely compress. Reverse was impossible without the release or shim being used. A tap on the brakes on the hiway would cause the trailer to slow the truck down. 3 years in and out of the salt water caused some lines to go. I replaced and bled and have never had the brakes as good as they were. If I chock a trailer tire and back up, I can easily compress the master cylinder piston all the way so it bottoms out. I should not be able to do that correct? I feel that there is air in there but I want to confirm that this bottoming out shouldnt happen ever in an effort to minimize variables. Ive brought the trailer to a number of expertsinch and theyve told me Im all set and then I hook it up and back it across their parking lot. piston bottomed out and brakes on, but not very hard, and the wheels turn while backing. No skidding. Expertsinch have never made it any better than Ive done for myself. Please advise. Thanks.
asked by: Cliff
Expert Reply:
It sounds like you have been testing this system quite a lot. There are several steps you can follow to trace where the problem is.
First, you did not say if this is a new brake system with disc brakes and was upgraded from drum brakes. If that is the case, the actuator should have been upgraded as well. The disc brakes require a higher amount of pressure to work than the drum brakes. If you have a disc brake actuator you can move on.
Next, check the calipers, and rotors for signs of wear. You would need to replace as needed. You said you chocked the wheels and was able to bottom out the cylinder piston. If you are using a truck or vehicle to get the brakes to work you can expect to bottom it out. If you bled the brakes, that is one way you can check for air leaks. You should see a steady stream of fluid when compressing the coupler. If it is not steady or maybe a trickle, there may be some blockage in the brake line.
I have attached a helpful article that explains how to add hydraulic disc brakes to a trailer you can check out. It also lists all the items you need.
If you find you do not have an actuator designed for disc brakes, let me know what the model number is of the system you have and I will be glad to make a recommendation that will work for you.
If you find you want to replace the coupler altogether, you can take a look at the attached link to the surge couplers we offer.

Product Page this Question was Asked From
Titan Zinc-Plated Brake Actuator w/ Electric Lockout - Disc - Multi-Fit Ball - Bolt On - 6,000 lbs
- Brake Actuator
- Surge Brake Actuator
- Farm Trailer
- Boat Trailer
- Construction Trailer
- Travel Trailer
- Utility Trailer
- Bolt-On
- 6000 lbs GTW
- 1-7/8 Inch Ball Coupler
- 2 Inch Ball Coupler
- 3 Inch Channel Tongue
- Disc Brakes
- Electric Lockout
- Titan
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Video: Replacement Master Cylinder for Dexter Aero 7500 Brake Actuators Spec Review
- Q&A: Option to Replace Master Cylinder For Disc Surge Brakes on Single Axle Boat Trailer
- Search Results: titan aero 7500 actuator
- Video: Comprehensive Review: Demco Spare Tire Mount for Bolt-On Swivel Jack
- Q&A: What are the Dimensions of the Titan Aero 7500 Brake Actuator With Manual Lockout # T63FR
- Shop: Replacement Master Cylinder Assembly for Dexter Model 60 Brake Actuators - Disc
- Shop: Replacement Master Cylinder Assembly for Dexter Brake Actuators - Disc Brakes
- Shop: Replacement Master Cylinder for Dexter Aero 7500 Brake Actuators - Disc
- Shop: Replacement Master Cylinder for Dexter Aero 7500 Brake Actuators - Drum
- Shop: Master Cylinder Rebuild Kit for Demco Kar Kaddy 3 with Drum Brakes and Demco Drum Brake Actuator
- Shop: Replacement Master Cylinder Assembly for Dexter Model 10 and Model 20 Brake Actuators - Disc
- Search Results: trailer hitch
- Q&A: Replacement Master Cylinder Body for Titan Model 60 or Aero 7500 Disc Brake Actuators
- Q&A: Troubleshooting Surge Brakes Locking up When in Reverse
- Q&A: Replacement Master Cylinder for Titan Aero 7500 Brake Actuating Coupler for Disc Brakes
- Q&A: Mounting Hole Dimensions for Replacement Master Cylinder for Dexter Aero 7500 Brake Actuators
- Q&A: Correct Way to Wire Trailer Breakaway Kit
- Shop: Trailer Hitch
- Shop: EcoHitch Stealth Trailer Hitch Receiver - Custom Fit - 2"
- Article: Breakaway Kit Installation for Single and Dual Brake Axle Trailers
- Shop: Lift Assist
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Shop: Trailer Wiring
- Video: Finding the Right Trailer Wiring Harness
- Article: Trailer Wiring Diagrams
- Search Results: trailer wiring
- Video: How to Choose a Trailer Brake Controller
- Video: Installing the Towsmart Trailer Hitch Receiver on a 2024 Toyota RAV4
- Article: How to Measure for Trailer Hitch Drop
- Search Results: trailer hitch ball mount