Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×

Thread Tools Search this Thread Display Modes
Old 01-27-2017, 01:19 PM   #1
1987 34.5' Airstream 345
Springfield , Ohio
Join Date: Dec 2016
Posts: 155
Dual circuit brake controller?

My 345 has a single electric brake controller installed. I am interested in having a new inertia brake controller installed along with new tag axle brakes. It seems logical that when towing a trailer the brake control values for it will likely be different than the tag axle. I can't find information addressing the question and have sent an email to Tekonsha (sp?) but have not heard back from them. One answer could be to have two controllers but that would be less than optimal. Has anyone dealt with this issue?
John Woodrow is offline   Reply With Quote
Old 01-27-2017, 02:32 PM   #2
4 Rivet Member
1986 34.5' Airstream 345
Alliance , Ohio
Join Date: Apr 2007
Posts: 251
How heavy a trailer are you towing? The 345 really can't pull too much unless you've done some upgrades. You might have this covered but thought I should raise a flag in any case. I tow an HHR that exceeds the recommended 2000 pound Airstream rating. I have reinforced the rear frame and hitch and have a brake system in the HHR that activates by air pressure modulated by the brake line pressure in the 345. I believe the issue with the frame is lateral rigidity of that long extension behind the rear and tag axles. Others may chime in on this. This might have been a little off track for what you were asking, but I do see your point about the tag brakes and trailer brakes requiring different control.
mehes is offline   Reply With Quote
Old 01-31-2017, 07:21 AM   #3
1987 34.5' Airstream 345
Springfield , Ohio
Join Date: Dec 2016
Posts: 155
I did get a response from the brake control manufacturer. They don't offer a dual circuit unit and recommend using separate controllers for the tag and trailer. I suppose that one controller adjusted for the tag axle could handle a trailer too. Would the extra draw of trailer brakes on the controller line change the value the tag brakes saw when braking? Any electrical engineers out there?
John Woodrow is offline   Reply With Quote
Old 02-14-2017, 12:54 PM   #4
1987 34.5' Airstream 345
Springfield , Ohio
Join Date: Dec 2016
Posts: 155

Turns out that my single electric brake controller is wired to the tag axle and trailer brakes. It's the "old school" type controller that ramps up at a fixed rate to the adjusted final output voltage. The new style proportional control units self adjust immediately in accordance with how hard you stand on the
pedal. I think that is preferable for the tag axle in the event of a "panic" stop. The local truck chassis service folks quoted $425 to install and set up new 12" loaded backing plates and a proportional controller for the tag axle.
I think that's the thing to do. I'll end up with two controllers, each optimized for their specific task.
John Woodrow is offline   Reply With Quote
Old 02-14-2017, 01:55 PM   #5
Rivet Master
bkahler's Avatar

1974 20' Argosy 20
Richmond , Kentucky
Join Date: Jan 2003
Posts: 8,550
John, dual controllers sounds like the right approach. I think you'll like the braking response a lot better.

Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
bkahler is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
What Brake Controller Are You Using On Hydraulic Brake Classics? KJRitchie 2006 - 2010 Classic (all lengths) 30 09-25-2014 12:03 PM
Brake lights, brake controller not functioning adwriter73 Brakes & Brake Controllers 17 01-16-2014 09:37 AM
E53 w/ Tekonsha brake controller lights 3rd brake light when manual lever applied warmrain Brakes & Brake Controllers 10 11-14-2013 09:35 AM
Brake controller or trailer brake problem? (newbie alert) jornvango Brakes & Brake Controllers 2 11-01-2012 02:17 PM
New F150 '09 brake controller vs. Prodigy brake controller dukester Brakes & Brake Controllers 17 01-20-2009 10:46 PM

Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.

All times are GMT -6. The time now is 06:15 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.