Look at the pre trip my way by Daniel on this site. Im not smart enough to post the handy dandy blue links. Lots of pictures. Type it in the search box.
Thanks for the referral Tractor Man! I just glanced at the first page as I'm too sleepy right now, but that's definitely bookmark-worthy.
I suggest you take some practice tests. You may have it down better than you think. It is a little overwhelming.
Regarding the psi's, just try to look at the logic behind each of them. Approx 125 is fully charged, so that's when governor will cut out. 1/2 that is about 60 psi, and that's when life is starting to get scary. 1/2 of that is 30 (20-45) and now the truck has decided to take the decisions away from you and apply brakes for you, lol. That's how I learned it.
Regarding testing the brakes, straight truck = less brake line, so smaller numbers (2, foot off, 3 foot on). Combo = more air line (3, foot off, 4 foot on). They all get timed for 1 minute.
Hope this helps a little. Everyone learns stuff different ways. You will find something that works for you!
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I've been studying the High Road Practice Questions (so awesome) for a month. I have processed the general knowledge pretty well. I'm now in the re-studying phase because air brakes are burning my brain. Does anyone have any tips for remembering it all for the permit test? I'm trying to visualize everything, and remember the PSI's, the gauges, and the brake system parts. I've seen others on here say they're not mechanically-inclined, so how did you connect A to B while studying? How long did it take you to study before you felt comfortable enough to go for it?