Profile For Ryann M.

It makes a lot of sense, now that I think about it, that air brakes WOULD be the standard. I am currently studying a lot of information about coupling trailers, and it wouldn't make sense to have mismatched systems. For the test, I will make sure I know the testing procedure for hydraulic brakes, even though the truck/trailer I use will probably have air brakes, so I can relate that information to the examiner. The Vehicle Inspection Test is the one I am most concerned with, so I am devoting a lot of time to make sure I know what to check and how to perform all checks.

I am definitely going to cross reference the "High Road" if I get confused. The CDL Handbook is extensive but not written to be easily understood at all times by individuals new to trucking. I wonder if anyone who works on writing it has any real-world experience? Probably not ;(

Thanks for all the replies and information.

Thanks Delco Dave, I was sure I was just over-complicating the questions. This is such a great forum, and I am happy to be able to pose questions with experienced drivers!

Another question: Do modern trucks use both hydraulic AND air brake systems? The CDL handbook places considerable emphasis on both systems, although, it would seem redundant to have both systems. I am also using Daniel B's Trucking Truth Pre-Inspection Guide to get as muck knowledge as possible before going to trucking school, and his guide mentions air brake inspections for the DMV (post-permit and school) tests, but nothing about hydraulic tests. My assumption is that the CDL Handbook is covering all bases by discussing how to check and operate both systems.

Hi truckers,

I am currently studying for my CDL permit, and I am having trouble differentiating between the Applied Leakage Test and the Static Leakage Test, with regards to the maximum air loss rate. Both tests require a fully-charged air system, before the engine is turned off. and take one minute. Is the only real difference that the static test is without any braking measures, allowing the air to escape on its own, while the applied test requires the driver to press and hold the service brake during the 1 minute test?

I keep missing the practice test questions, and it is frustrating because sometimes the correct answer is 2 psi/minute and sometimes it is 3psi/minute for a single vehicle. Is the "Brake Off or Brake On" the important wording in these questions?

Thanks in advance for your input,

Ryann