Converting an M105A Military Trailer Air Over Hydraulic to Electric Over Hydraulic Drum Brakes
Published 08/20/2019 >
Products Featured in This Question
Question:
Wondering which 7 way trailer wiring kit you would recommend to go along with the products you recommended. I will be converting the trailer from 24V to 12V for ease of installation and future use. Thanks again!
asked by: Bill C
Expert Reply:
I have the perfect solution for you!
The first thing you need to do is swap out your actuator and for that I recommend using the USA made HydraStar Electric Over Hydraulic Actuator for Drum Brakes # HBA-12 because this company makes very reliable equipment and they receive great reviews from our customers. From my information military trailers like your M105A use larger 1/4" brake lines so you should also need the Fitting # HS43-9035 to make this actuator compatible with your trailer brake lines.
Then all you need is an electric brake controller on your 2003 Hummer H2 to activate the trailer brakes. If you don't already have one then I highly recommend the Redarc Tow-Pro Elite # RED44FR with the Adapter # 3015-S for your application. This brake controller has 2 modes of operation you can use depending on what kind of terrain you are traveling. For highway/road use you want the proportional mode which activates the brakes at the same time and strength as the brake pedal on your Hummer. For off-road or mountainous terrain it has the user-control mode which activates the brakes using a set intensity.
The Tow-Pro Elite also has a unique design in that the only part of it that you need access to is the small control knob. The brains of the unit can be mounted virtually anywhere you have room for it. This brake controller is also made in Australia and is very popular for off-road towing so you know you are getting a great product.
Attached are some review videos that you can check out.
Product Page this Question was Asked From
Hydrastar Electric Over Hydraulic Actuator for Drum Brakes - 1,200 psi
- Brake Actuator
- Electric-Hydraulic Brake Actuator
- Boat Trailer
- Travel Trailer
- Drum Brakes
- Hydrastar
more information >
Featured Help Information
Miscellaneous Media





Continue Researching
- Shop: Fifth Wheel Hitch
- Shop: Curt A20 5th Wheel Trailer Hitch w/ S20 Slider for Ram - Dual Jaw - 20,000 lbs
- Shop: Air Lift WirelessAIR Compressor System for Air Helper Springs - Remote - Bluetooth
- Shop: B&W Companion OEM 5th Wheel Hitch for Ram Towing Prep Package - Dual Jaw - 25,000 lbs
- Shop: PullRite SuperGlide 5th Wheel Hitch for Ram Factory Prep Package - 24K
- Shop: Convert-A-Ball Cushioned 5th-Wheel-to-Gooseneck Adapter w/ Offset - 12" to 16" Tall
- Shop: B&W Companion Slider Gooseneck-to-5th-Wheel Trailer Hitch Adapter - Dual Jaw - 20,000 lbs
- Shop: Pacbrake Premium In-Cab Air Control Kit w/ Compressor, Tank, and Digital Gauge - Independent Fill
- Article: 4 Steps to Choosing Your 5th Wheel Pin Box
- Q&A: How to Pair a New Controller to the New Air Lift WirelessAIR Compressor System
- Video: Let’s Check Out the B and W Companion Slider Gooseneck-to-5th-Wheel Trailer Hitch Adapter
- Shop: Brake Controller
- Video: Curt 5th Wheel Hitch Adapter Rails Review
- Shop: Gooseneck Hitch
- Search Results: trailer hitch
- Q&A: What Is An OEM Prep Package And How Do I Know If I Have It
- Shop: Trailer Hitch
- Article: Trailer Wiring Diagrams
- Search Results: trailer tires and wheels
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- 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
- Video: B&W Companion OEM 5th Wheel Hitch Manufacturer Breakdown
- Article: How to Measure for Trailer Hitch Drop
- Shop: Suspension Enhancement
- Q&A: Recommended B&W Companion 5th Wheel Hitches for the Ram Puck System
- Search Results: trailer wiring
- Q&A: Does Truck with 6-1/2 ft bed Have to Use Slider Hitch for Turning Clearance with Fifth Wheel Hitch
- Video: In-Depth Look at the B&W 5th Wheel to Gooseneck Pin Box


Bill C.
8/2/2019
I have the perfect solution for you! The first thing you need to do is swap out your actuator and for that I recommend using the USA made HydraStar Electric Over Hydraulic Actuator for Drum Brakes # HBA-12 because this company makes very reliable equipment and they receive great reviews from our customers. From my information military trailers like your M105A use larger 1/4" brake lines so you should also need the Fitting # HS43-9035 to make this actuator compatible with your trailer brake lines. Then all you need is an electric brake controller on your 2003 Hummer H2 to activate the trailer brakes. If you don't already have one then I highly recommend the Redarc Tow-Pro Elite # 331-EBRH-ACCV2 with the Adapter # 3015-S for your application. This brake controller has 2 modes of operation you can use depending on what kind of terrain you are traveling. For highway/road use you want the proportional mode which activates the brakes at the same time and strength as the brake pedal on your Hummer. For off-road or mountainous terrain it has the user-control mode which activates the brakes using a set intensity. The Tow-Pro Elite also has a unique design in that the only part of it that you need access to is the small control knob. The brains of the unit can be mounted virtually anywhere you have room for it. This brake controller is also made in Australia and is very popular for off-road towing so you know you are getting a great product. Attached are some review videos that you can check out.