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ThaddeusW

Blue Knob On Dash For Parking

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Hey guys I cant seem to find out what the third blue knob on the dashboard does. Yellow is parking for the truck/tractor and red is trailer air supply. What does the blue one do?

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blue is tractor park

yellow is tractor and trailer park

red is trailer park

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blue is tractor park

yellow is tractor and trailer park

red is trailer park

When you pull the yellow knob out does the red one automatically pop out?

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if you are hooked to a trailer and pull the yellow one I think the red pops out also. when the blue is pulled the yellow and red stay in.. I move the truck every day and never stop to think about it but I think thats how mine works

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ya trent when you pull the yellow the red pops out too the blue is sperate and doesnt pop out automatically when the other 2 are pulled.

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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.

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