Recommendations For Converting To Electric Brakes On A M105A2 Trailer
Updated 12/27/2021 | Published 12/26/2021
Products Featured in This Question
Question:
I too have a M105A2 trailer. I just purchased it and I brakes are still the existing hydraulic system. I have also just purchased new wheels and tires it’s a lug pattern of 6 x 8 3/4. I will eventually be retro fitting the brakes at electric since I am also replacing the trailer plug to a 7 prong. I drive a 2017 F250 that has has the OEM assistance switch. With all that said, can you give me parts list for new brakes? I would also like to keep the manual brake chock locking if possible, it’s has worked like a champ even as old as this trailer is. I should be getting the new tire set up soon and would like to do the brakes while I have the tires off. Thanks.
asked by: Scott V
Expert Reply:
It looks like the M105A2 military trailers used an axle in the range of of our 5,200 to 7,000 pounds capacity brakes, so I recommend going with the etrailer.com Electric Trailer Brake Kit # AKEBRK-7-SA. These are self adjusting, so you will not need to mess with them every year to keep the braking consistent and will measure 12" in diameter and 2" wide. With all that said, I do also recommend double checking a few things.
First, make sure the 12" x 2" matches your current brakes/drums. The 6 on 8-3/4 bolt pattern is not one used with civilian market trailers, so the hub/drum may also be different.
Second, make sure the bolt pattern for mounting the brakes matches what this will come with. I included a picture with how it measures as explaining it would be confusing. Pictures are definitely worth a thousand words in this case.
Third, make sure your drum has a smooth surface for the brake magnet to adhere to. Not all hydraulic brakes can be used with electric brakes. If the surface is smooth, you are good to go. If it is not, let me know. I included a picture of what I mean for this as well.
You will of course need some wiring, like the # 10-1-1 (sold by the foot), to get everything working properly, but the Epicord Junction Box # 277-000141 makes this a lot easier and comes with a 7 Way plug pre-attached. It is also required for a trailer of this weight to have a break away kit installed, and the Hopkins Engager # 20099 will work perfectly for that.
I do have to mention that I am unsure what the manual brake chock is, so I cannot say if this function will be able to be retained or not.
(click to enlarge)
(click to enlarge)
Product Page this Question was Asked From
Hydrastar Electric Over Hydraulic Actuator for Drum Brakes - 1,000 psi
- Brake Actuator
- Electric-Hydraulic Brake Actuator
- Boat Trailer
- Travel Trailer
- Drum Brakes
- Hydrastar
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Video: Hands-On with the Dexter Electric Brake Assembly for 4 Bolt or 5 Bolt Flange
- Search Results: 272 inch od trailer bearings races seals caps
- Search Results: grease caps
- Shop: etrailer Electric Trailer Brakes - Self-Adjusting - 12" - Left/Right Hand - 5.2K to 7K
- Q&A: Replacement 12" X 2" 6,000LB Trailer Brakes For Coachmen Camper With 23-105-00 and 23-106-00 Brakes
- Q&A: Will the Dexter 23-105-106-09 Fit AL-KO 5200k Axles
- Q&A: Trailer Brake Assemblies For a 5.2K to 7K Axle With 12" Drum and 3-1/4" by 2-3/4" Flange Bolts
- Q&A: Replacement Brakes for Trailer With 12" x 2" Brake Assemblies and 4 Bolt Brake Flange
- Q&A: Center Hole Diameter of Brake Assembly 23-106-09
- Q&A: Will 12" Dexter Electric Brakes w/4 and 5 Bolt Pattern # 23-105-106-09 Fit in Place of Hayes Brakes
- Q&A: Replacement Brake Assemblies For Al-KO Or Hayes 4-Bolt Flange
- Shop: Single Axle Trailer Fender w/ Backing Plate - Steel - 13" to 14" Wheels - Qty 1
- Shop: etrailer Single Axle Trailer Fender w/ Side Steps - Black Plastic - 13" Wheels - Qty 1
- Shop: Bulldog Winch Ratcheting Wheel Tie-Down Strap for Oversize Spare Tire - Horizontal Mount - 2,000 lbs
- Shop: Rambler ST205/75R15 Trailer Tire with Black Vesper Mod Wheel - 5 on 4-1/2
- Shop: Strider ST235/80R16 Radial Trailer Tire w/ 16" Revolver Black Mod Wheel - 8 on 6-1/2 - LR E
- Shop: Brake Mounting Flange for 3" Round Axle
- Article: Parts Needed to Add Electric Drum Brakes to a Trailer
- Article: How to Measure Your Trailer Wheel Bolt Pattern
- Video: All About the etrailer Electric Trailer Brakes w/ Dust Shields
- Shop: Trailer Hitch
- Search Results: trailer hitch
- Article: Trailer Wiring Diagrams
- Search Results: trailer tires and wheels
- Shop: Trailer Wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Video: Firestone Ride-Rite Air Bags with Easy Mount Compressor Feature Breakdown
- Search Results: trailer wiring
- Video: Measuring To Choose The Right Trailer Axle
- Shop: Brake Controller
on Brake Actuator
