The 'tractor protection valve'

good advice

and with winter comming who wants to blow water into the air lines so it can freeze

 

Okay, now I fully realize what I was sure of when I did the practice prior to having badged examiner in-cab, which is why I hired Jeff.

The two valves have some "tricked" inter-operation that is based on design-time efforts consequent to what happens in operation ...... so if we have a catastrophic failure event anywhere on the trailer air then only the trailer boogie goes into lock-up and the tractor continues to operate within design parameters so the driver can concentrate on reducing dac issues and crash-event risk ....

so, seriously, once the valve(s) are in "operate" position there would be some dampened system-adjustments to prevent un-anticipated system changes and the warning buzzers go off b4 un-anticipated system changes occur ....

that's what I thought

 

Right on, you got it!

 

Everybody knows the blue button activates the bat signal.

 

Good job bender.

 

This is how I feel some mornings, very outdated.

 

My superiors in my workplace who are much older than I still call the red push/pull or trailer charge knob the tractor protection valve. It's very old school terminology and drives me nuts trying to insulate the younger guys from picking up this habit.

 

I know exactly what you mean. When they went from the lever style flip switch to the red buttons I couldn't even tell you what it says on the button anymore. On the dash in the old days they had several flip style switches that were all identical looking so you had to read the tag until you got used to the truck.

 

I worked on a bunch of those flip/toggle types and drove some too. Most of them had a worn out cover plate that was no longer legible. This led to allot of trial and error flipping until you got the correct response you were looking for.

 

Thats right, printing worn off, I can still hear the sound that they made when you flipped them over. You mentioned the old timers still refering to the tractor protector valve, (and I still do this, old habits are hard to break), but it reminded me of when I was a kid. I had an aunt, a really grand lady, that still refered to their chevy as "the machine", I always thought that was so funny as a kid. I can still hear her voice saying "Pap, lets get in the machine and go in to town and get us a custard".