6th times the charm?

THeGAME,
I really don't know where to begin after reading your previous reply...
Your view, honestly, is so off-base, imo, on so many levels. I really think you need a better grasp on how the "mechanicals" & various systems work in a truck before proclaiming things as fact. Take your time to really learn how the various parts and systems really function. Some "Salty Old Dogs" are sharp as a Kabar, others not so much.
I don't want to sound harsh or demeaning,, just callin it as I see it, in rebuttal.

I realize there are "some" variances in state-to-state CDL testing, however to say such things as:

That statement makes zero sense, in ANY state. I think you are misinterpreting or misunderstanding a lot of things, honestly.

You didn't even comprehend my post above, or the main point, which was... You agreed with the notion that, as Bigfoot stated, the popout valves activate "Around 40 in the summer and 20 in the cold". You said he was correct and I was wrong.

I'm (still) saying temperature has zero to do with their activation. If the valve is set to pop-out at 35psi, it will popout at 35psi whether the truck is in Denver or Death Valley. There will not be any variation of 20psi strictly related to how hot or cold the climate is. There may be a normal <5psi variation/tolerance, strictly due to it being spring/mechanical vs air pressure activated device, as with anything mechanical, but not due to "climate".

Also, there is a federal DOT regulation on air brake equipment/components, of which climate and temperature has no bearing on the air brake components we are discussing.

The DOT spec is: § 393.43: Breakaway and emergency braking. Read the regs, as they are important.

That is THE regulation for emergency braking equipment (popout valves included), in any state. There are many more DOT regs pertaining to air brake components and their operation. It does not matter if you truck in Idaho or Indiana, or wherever.

Temperature/climate has no effect on brake air pressure itself, or the pop-out valve operation.
Air pressure of 125 psi in 130° Death Valley is no different than supply air pressure of 125 psi in 10° Washington State. (or any identical air pressures)
We're not talking about how desert heat can hasten brake fade. Nor needing alcohol to thaw water in your lines on those frigid occasions in Alaska.
Just popout valve operation, which was the only subject of my initial post. Seriously tho, good luck on your 6th try.

 

TheGAME, First I want to wish you luck on your next test.
In a few weeks I will be setting a date for my PTI/road test. I went the school route and happy I have so far.
As some said schools only teach to pass the test but the good trainers also give pointers for real world too. Now between 2 different trainers that have evaluated me in the last 2 days have told me 2 different “other things” we should check, 1 being the grille “not loose/secured”! Or not pointing out a trailer side door or trailer tire rack that where not on the trailer I was using. I don’t think the “test” rig has a side door or rack. I told the trainer if it was there I would have pointed it out they said I had to tell the inspector even if it was not on the rig?

As big foot posted some inspectors can be “Richards” from what I hear from class mates that have failed. Like one that did not want to stay a little later to finish the test because the state does not pay overtime and failed him so he could go home. If that happens to me I would be pissed!

As for the 40 – 20 PSI for the buttons popping out. I believe that is the range given for them and temp has little to do with it. I say this because school has many trucks we train with and each one has a different PSI they pop out at.
Here with tractor wheels chock, a full tank of air, motor off/key on/buttons in after the “not more than” 3psi@ 1 min and the “not more than” 4psi@ 1 min service brake on, and the fan down to “around” 60psi for the low air warning light and/or buzzer, we say going to fan down to 40 to 20 to test emergency buttons pop out. DO NOT touch or pull them out or it is a fail.
I have had some trucks pop out just below 40 and others all the way down to 20 on the same day/temp.

I will say what the school is training us for the PTI is how you should do the real PTI as we are checking everything: clean, not cracked/broken working & secured if you can touch it, if not “appears” (lights), no cuts/cracks/abrasions not leaking (hoses/wires), Not cracked/broken or missing pieces and appears secure (suspension components cant touch), etc.

TheGAME, what is your skill test like before the road test? Here we have to do a parallel park, forward & straight back, and ally dock in that order before we can hit the road. That is after a drop & hook and the PTI/brake test.
Dave ----
sorry so long

 

Lots of great info here. Im a greenhorn and am absorbing as much info as I can. What I keep reminding myself is, that when it comes to hoses I remember A. B. C. (Abrasions, Bumps, and Cuts) and for metal parts B. B. C. (Bent, Broken, or Cracked)

 

I'm nervous about double clutch myself

 

Dont be. I was new to it as well, but got the hang quick. Instructor said.....its the car guys that are the worst, i have to brk you of ur bad habits. Haaaaa. Contact me should u need any help.

 

Congratulations!!!!!!!!!!!!!!!!!!!!!!! What a way to start the weekend.

 

I think everyone has that sigh of relief when they pass and realize, hey that was pretty easy! Congrats!