Converting M105A2 Military Surplus Cargo Trailer to Electric Drum Brake Operation

Updated 04/26/2017 | Published 04/25/2017

Products Featured in This Question

Trailer Axle w/ Electric Brakes - Easy Grease - 5 on 4-1/2 Bolt Pattern - 89" Long - 3,500 lbs

(248)

$523.79

Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires

(3469)

$120.66

Question:

i was wondering how hard would it be to change the air over hydraulic brakes on an M105A2 so i can use it with my 2013 toyota tundra ?

asked by: John H

Expert Reply:

The simplest and least costly trailer brake conversion is to switch to electric drum brakes. Electric drums only require wiring - no hydraulic plumbing and no actuator - which makes the overall installation time much shorter. Electric brakes are also easier to maintain than hydraulics.

You can refer to the linked article for details on the things to consider when making such a conversion. The article includes links to each required item. We do also offer complete axle kits with hub/drums and brakes and these can sometimes be easier than putting together the individual items needed to modify your existing axle. Such a kit is the 3500-lb-rated kit # e43SR.

Electric brakes require the vehicle to have a brake controller such as # 90885. If your Tundra has a factory 7-way all you need is the controller itself and wiring adapter # 3040-P. If it has a 4-pole the instead you will use install kit # ETBC7 to hardwire the controller.

expert reply by: Adam R