Converting an M105A Military Trailer Air Over Hydraulic to Electric Over Hydraulic Drum Brakes

Published 08/20/2019

Products Featured in This Question

Hydrastar Electric Over Hydraulic Actuator for Drum Brakes - 1,200 psi

(73)

$944.55

Hopkins Engager Trailer Breakaway Kit w/ Charger, LED Tester, and 5 Ah Battery - Side Load

(754)

$62.18

Wiring Kit for Hydrastar Electric Over Hydraulic Actuators

(12)

$83.69

Brake Line Fitting for Hydrastar Hydraulic Brake Actuators - 1/4"

(6)

$31.46

Redarc Tow-Pro Elite Brake Controller - Dash Knob - Off-Road Mode - Up to 3 Axles - Proportional

(1683)

$290.00

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.

expert reply by: Jon G

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.

Jon G.

8/2/2019

I apologize as I should have recommended one in the first place. I recommend the Hopkins Engager Push-To-Test Trailer Breakaway Kit # 20099 because it has a built-in charger and is one of the best breakaway kits on the market. I have attached a review video as well as the installation instructions for you to check out.

Bill C.

8/20/2019

Jon G.

8/20/2019

I recommend using the Trailer Wiring 7-Way Upgrade Kit # e99011 because it comes with a junction box that really helps to organize your trailer wiring connections and ensure that everything is connected correctly. This not only comes with the junction box and 7-Way pigtail but it also comes with all of the ring terminals you need to complete the installation. I have attached a sample installation video that you can check out.