2007 Kenworth T600 Dash

Never pulled one apart,but my guess is that silver trim pulls out and the screws are behind that.
That’s how peterbilt hides the screws.

 

Chock wheels and release brakes.

Put a ear to each brake chamber and listen for bypassing air. If it is passing internally it can backfeed all the way up the MV3 exhaust port. Pinching off the service air hose at each chamber will also make the brake apply if this is the case.

From there if every thing checks out, I would dig in the dash for your leak.

 

Ahhh.....

Well the red and yellow knobs thread off counter clockwise.

Where there is no screws, start prying and popping panels. Plastic wedge shaped pry tool would be the go to tool for teardown.

Haven't had the pleasure on that dash either, sorry not more help.

 

I have the same truck.

Remove the air brake knobs, screw off. The silver trim and black area are one piece and pop off. Do it carefully as to not break the tabs.

After that, you're on your own as to how best to get behind that valve. Possibly remove the climate control cluster and see if you can get access behind it.

 

The air vale has its own panel held on by 4 screws and the valve itself has lines that are push in on mine the lines are not very long so it was a ##### to put new valve on. And whatever you do don't break the tabs on the panel when you take it apart or you can't tighten the valve back on don't ask how I know.