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Blue Knob On Dash For Parking


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Thanks guys!

I was looking at some air brake diagrams and at the function of the trailer valve on the bendix site. When you push the yellow knob in you not only supply air to the spring brakes but also send air to the control port on the trailer valve. Without the control signal the trailer valve pops out. The blue knob is downstream the park valve and trailer valve. It lets you park the tractor while keeping the control port on the trailer valve supplied allowing you to keep the trailer charged.

Here is a little diagram I pulled from a bendix diagram. I labeld and colored the valves according to the dash knob color.


What America needs is less bull and more Bulldog!

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