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  #1  
Old 18-05-20, 15:48
Jordan Baker's Avatar
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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RHLI Museum,
Otter LRC
C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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  #2  
Old 18-05-20, 16:56
Grant Bowker Grant Bowker is online now
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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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  #3  
Old 18-05-20, 19:04
Hanno Spoelstra's Avatar
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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  #4  
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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  #5  
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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1944 Ariel W/NG
1945 FGT FAT
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  #6  
Old 10-07-23, 20:18
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Hanno Spoelstra Hanno Spoelstra is offline
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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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  #7  
Old 11-07-23, 05:00
Bob Carriere Bob Carriere is offline
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Default My failing memory tells me......

....that early CMPs had a single wire connection directly behind the tow hook partly shielded by a small piece of sheet metal....... the female connector would have been very similar to the trouble light socket installed in the dash of cab 11/12...... not enough wires to see where or how connected to the main wiring loom....but easy enough to approximate.

Grant may remember our findings such remains on old rolling chassis..... it may have only been used for brakes or for convoy lights????

Never seen any printed information.
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  #8  
Old 11-07-23, 07:10
Grant Bowker Grant Bowker is online now
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Default trailer wiring plug found on CMP

Photos of what I believe is a CMP trailer wiring connetor are at http://www.mapleleafup.net/forums/sh...206#post256206 (13th post in the thread)
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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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