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sandtrooper

Brake control knob with arrow Bendix-Westinghouse

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Here is another knob I found and would ask if anyone can give a clue as to what the heck it might be for. Non-ferrous metal at about 2 1/4 inch diameter.

 

Thanks in advance for any intel.

 

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Likely it would modulate (or turn off) the front brakes in a truck air brake system. 

Stopping the braking action on the front wheels would allow more control in a wet/slippery situation 

Sticker on dash likely said "Increase - Decrease" and  was pointed to by the arrow. 

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