The leakage rate for a single vehicle with air brakes should be no more than ____ in one minute during a static leakage test.

When performing a static leakage test on a single vehicle with air brakes, the leakage rate should be no more than 2 psi in a minute. If the air leaks from the air brake system at a quicker rate, the vehicle should not be driven because something likely needs to be repaired.