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03-15-2019, 05:28 AM
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#1
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Member
Join Date: Aug 2016
Posts: 82
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Tapping into Air Brake Line on 2014 45’ Bus Powerglide Chassis for Toad Braking
I need to tap into the air brake line on a 2014 45’ Bus on a Powerglide Chassis for the M&G Brake installed in my toad. I have the Tee valve, Female Air connector and hoses from M&G.
What is the best place to tap into the air brake line?
Any other tips or things to watch out for?
If you have pictures to share that would be most appreciated.
__________________
2014 Tiffin Allegro Bus 45LP; 2016 Jeep Wrangler Unlimited
Blue Ox Aventa LX - M&G Brake System
Good Sam and FMCA Member
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03-15-2019, 07:55 AM
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#2
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Community Administrator
Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 21,565
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I did not want to cut any air lines on mine when I installed the M&G system. I added a short union, tee and a 1/2"-1/4" compression fitting on the line to the rear air brake.
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2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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03-15-2019, 08:05 AM
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#3
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Unfortunately my rig came tapped for a braking unit. I say that because rather than "T" off the rear splitter they just cut into the air line after the splitter and before the caliper. Works OK but I worry about the possible air volume difference and line breaking.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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03-15-2019, 08:50 AM
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#4
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Senior Member
Monaco Owners Club
Join Date: Aug 2017
Location: Orlando, Florida
Posts: 5,819
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I think you are right to be worried. The additional air volume to supply "tow car" air brake system could cause uneven braking on your coach if the tee is between the Relay valve and the caliper.
Probably not enough to be dangerous - but maybe cause uneven brake pad wear.
If I were adding tow-car braking system, I would tee at the "delivery" port to the Relay valve, so the application air from the brake pedal is equally applied to tow-car and coach brakes.
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03-15-2019, 08:40 PM
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#5
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Senior Member
Join Date: Oct 2014
Posts: 419
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The proper way to do this and the only version approved by OEMs as well as the Federal approval is SMI Airforce One. They add a separate manifold, control valve and ping tank. This provides proper proportional braking to the toad but protecting the coach brakes from an air leak.
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03-16-2019, 04:04 AM
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#6
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Senior Member
Join Date: Oct 2016
Location: Rendon, Texas
Posts: 1,463
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Since you have the M&G system, call them and ask their opinion. We have the M&G system on our toad and these folks are very knowledgeable and helpful over the phone.
__________________
May your smiles be many and the miles be plenty.
Karen & Allen Van Zandt
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03-16-2019, 04:29 AM
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#7
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Senior Member
Join Date: May 2014
Posts: 1,368
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MSTURTZ has a good point on proper way to do this, and there is a valid reason for the extra breaking axle to have its own air tank.
Approved by OEMs as well as the Federal approval is one, and the proper proportional braking to the toad but protecting the coach brakes from an air leak is the most important.
What ever you do, be sure you do not plumb in between a relay valve, and an ABS valve to any one side of an axle. Air volume difference could become a real concern under emergency braking conditions.
DTW
__________________
Dan & Loretta, US Army Retired Aero Scout Pilot
2012 Fleetwood Providence 42P Class A/DP
Spartan Chassis, 8.9L Cummins 450HP
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