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  #1  
Old 18-05-20, 14:05
Hanno Spoelstra's Avatar
Hanno Spoelstra Hanno Spoelstra is offline
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Default trailer air brake line
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Originally Posted by Jordan Baker View Post
In the CMP Service Bulletin book there is a write upon trailer air brake line being installed on the CMP frame.
Here are some photos of the air brake line setup on a C60S in Sweden.

Doe anyone have a manual on this trailer air brake line setup?

chevrolet-4x4-cmp-30-2-st-12616-15882557174_redlined.jpg chevrolet-4x4-cmp-30-2-st-12616-158825572912_redlined.jpg
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  #2  
Old 18-05-20, 14:22
Grant Bowker Grant Bowker is offline
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From what I can see, I would guess the truck shown above is more likely vacuum brake assist with vacuum brake for the trailer than air (pressure) brake. I base this on the little bit I can see of the lines to the cylinder and under the cab. The flexible connections look like simple hose clamped to tube which is more typical of vacuum than air brakes. Having said that, I believe air brakes of the WW2 era operated on lower pressure than current trucks so I could easily be wrong.
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  #3  
Old 18-05-20, 15:48
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Jordan Baker Jordan Baker is offline
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Scanned copy of

Service Information Bulletin #51, May 3, 1943
Trailer Brake Installation
Attached Files
File Type: pdf S.I.B.51 Airbrakes.pdf (1.13 MB, 31 views)
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Old 18-05-20, 16:56
Grant Bowker Grant Bowker is offline
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I know this is getting picky but that is a vacuum brake system for the trailer as opposed to air (pressure) brakes to go with the vacuum boosted system of the heavier CMPs. It does make sense to use the same power source for both. Also, I'm not aware of any CMP equipped with air (pressure) brakes except some trailers (usually towed by larger vehicles than CMP 3 tonners). As always, happy to learn more - even if it proves me wrong....
Last edited by Grant Bowker; 18-05-20 at 19:03.
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  #5  
Old 18-05-20, 19:04
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Hanno Spoelstra Hanno Spoelstra is offline
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Default Trailer air brake line
Quote:
Originally Posted by Grant Bowker View Post
I know this is getting picky but that is a vacuum brake system for the trailer as opposed to air (pressure) brakes to go with the vacuum boosted system of the heavier CMPs. It does make sense to use the same power source for both. Also, I'm not aware of any CMP equipped with air (pressure) brakes except some trailers. As always, happy to learn more - even if it proves me wrong....
Grant, you must be right.

I thought I had seen pictures of the trailer air brake line setup on this forum before. I recalled it was for actuating trailer brakes, not boosting thr truck's brakes.

If it was a pressurised system, the truck would have to be equipped with a compressor but I see no signs of that.
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  #6  
Old 10-07-23, 17:12
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Hanno Spoelstra Hanno Spoelstra is offline
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Default US trailer socket
Jordan found a wartime photo:

"Interesting detail on the back side of this C15A. Check out the US trailer socket."

358388543_10158959598411783_6390413979413751128_n.jpg
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  #7  
Old 10-07-23, 17:18
m606paz m606paz is offline
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My 1945 FGT have factory US Trailer Socket. Installation coming soon
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File Type: jpg 20230710_122014.jpg (172.2 KB, 11 views)
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  #8  
Old 10-07-23, 20:18
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Quote:
Originally Posted by Hanno Spoelstra View Post
Jordan found a wartime photo:

"Interesting detail on the back side of this C15A. Check out the US trailer socket."
This is where the US trailer socket was mounted on my F15A. I doubt it was an original fitment, though.

IMG_1031.jpeg
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  #9  
Old 18-05-20, 18:59
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Hanno Spoelstra Hanno Spoelstra is offline
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Quote:
Originally Posted by Jordan Baker View Post
Scanned copy of

Service Information Bulletin #51, May 3, 1943
Trailer Brake Installation
Thanks Jordan!
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