AMT Exterior Post Doubles Vans

[Bren]

I'm doing this build right now - basically box stock with different wheels/tires. Could any of you gentlemen enlighten me on the routing of the air brake lines under the floor of the trailers? I've searched the interwebs but can't find any reference photos to help. Thanks!

 

Bren

[Force]

Here is a diagram.
On trailers you only have two lines, one supply line (red) wich supplies air to the trailer air tanks and one service line (blue) wich gets the air from the brake pedal and truck brake system and actuate the brake valves and brakes on the trailer, and one cirquit for parking brakes (yellow) if the trailer has maxis.
A converter dolly and a trailer is pretty much the same thing and has the same setup depending on how many axles they have.

Edited July 15, 2024 by Force

[Bren]

Thanks Hakan - I have that schematic too. I actually need to know where the airline physically runs - is it visible below the trailer floor and if so - where is it? Off to the side, down the middle etc…..

 

thanks, 

Bren

[Force]

That most likely depends on the manufacturer, but most I have seen the lines are run on one of the frame rails or if ot doesn't have a frame near the middle under the floor as that's close to where they are going, that will say the trailer air tank and brakes.

Look at this ad.

https://www.itagequipment.com/for-sale/2015-iti-48x102-open-top-trailer-12568104

[Bren]

That’s exactly what I was looking for - thanks Hakan!

[Rockford]

To add to what's already been said, this video on YouTube shows how they piped up the Fruehauf 40ft van. I know you're doing a Trailmobile but the method is just the same except for you not having to accommodate the sliding bogie, your hard lines could go straight to the reservoir. Here's some stills:-

 

 

 

Remember too that the trailer you're building only has service brake chambers not spring brakes so each chamber only has one airline to it. Trailers so equipped in UK used to have a mechanical cranked on park brake mechanism but I've never seen one on a US trailer. 

Edited July 15, 2024 by Rockford
Edited photos

[Bren]

11 hours ago, Rockford said:

To add to what's already been said, this video on YouTube shows how they piped up the Fruehauf 40ft van. I know you're doing a Trailmobile but the method is just the same except for you not having to accommodate the sliding bogie, your hard lines could go straight to the reservoir. Here's some stills:-

 

 

 

Remember too that the trailer you're building only has service brake chambers not spring brakes so each chamber only has one airline to it. Trailers so equipped in UK used to have a mechanical cranked on park brake mechanism but I've never seen one on a US trailer. 

Thanks so much for your help - this is great!

Bren

[Force]

On 7/15/2024 at 6:33 PM, Rockford said:

To add to what's already been said, this video on YouTube shows how they piped up the Fruehauf 40ft van. I know you're doing a Trailmobile but the method is just the same except for you not having to accommodate the sliding bogie, your hard lines could go straight to the reservoir. Here's some stills:-

 

 

 

Remember too that the trailer you're building only has service brake chambers not spring brakes so each chamber only has one airline to it. Trailers so equipped in UK used to have a mechanical cranked on park brake mechanism but I've never seen one on a US trailer. 

We had the same parking brake system here in Sweden, a crank mechanism pulling wires to apply the service brakes manually on one axle when it's parked.
Now that's gone since they started to use Maxis on trailers.