sandtrooper Posted December 4, 2017 Share Posted December 4, 2017 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. Link to comment Share on other sites More sharing options...
m-mman Posted December 5, 2017 Share Posted December 5, 2017 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. 1 Link to comment Share on other sites More sharing options...
sandtrooper Posted December 6, 2017 Author Share Posted December 6, 2017 You are the 'm-mman' ...thanks for your time and effort providing this intel. Link to comment Share on other sites More sharing options...
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