Air brakes.Yellow and red knobs on Ford l8000 dump truck. Which knob to push in to drive?

Just the yellow. The red is trailer supply.

 

If it’s a typical straight truck-dump truck you would just use the yellow to drive/park, the red knob would be left in the pulled out position.

The red knob SHOULD be the air supply for a pup or tag trailer if the truck is set up for a trailer.

 

Yellow should be a diamond and red should be 6 sided stop sign.

Red feeds trailer attached to your dump truck. Otherwise it stays out yellow IS your actual dump truck.

 

Don't they teach this for the cdl?

 

Apparently not.

Which is a shame. Ive been sleepless last night wondering. I don't mind rookie questions. But everyone should know Mr Buttons first week.

God, I hope he does not take truck out onto public roads without passing the airbrake written test and have that as a restriction against same.

 

If it's for ag use, depending on the state, he might not even have a CDL.

 

That's what I was thinking. I was driving a dump truck on the farm I grew up on long before I even had a drivers license let alone a CDL.

 

It depends on the year model, I keep my trailer valves and charge the system, so that I will have decent brakes bobtailing.

 

Just imagine if the truck had the blue knob.....

Sadly, there's probably some that don't know what the blue knob was for