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Berg emergency pull-push knob... charge?

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Can anyone say what this might be for... truck, auto or whatnot? It is about 2 inch diameter - lightweight non-ferrous metal. Found in a box of truck parts in garage sale.


Thanks in advance for any skinny on this. 





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Yes. Pushing in supplies compressed air to the 'spring brakes' releasing them so they will roll. 

Pulling it out (or breaking the air line to the trailer) lets air escape and the springs automatically apply the brakes in a full lock situation. 

Today this control would be a yellow diamond shape. 


Edited by m-mman (see edit history)
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