Air Brake Test.
Same test that a license examiner would give someone taking a drivers license test in a vehicle with air brakes. Same test that should be done prior to setting out each day --- test can help spot many air leak problems. One example: my used Freightliner tested fine for 2-3 weeks after I purchased it. One time it showed a small loss of air ie it failed the air brake test --- took truck in and had one of the rear brake air chambers replaced - was leaking when brakes were "off" -- no leak when "on".
You can check various State Commercial Drivers License Manuals on-line to see how it is done - that is one source. -- or someone on the forum might have good verbage of the test and can post the required steps - test is all done from the drivers seat.
don
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