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After the initial drop, the maximum acceptable leakage rates per minute are

A
Explaination
The initial loss rate should be less than 2 psi in one minute for single vehicles and less than 3 psi in one minute for combination vehicles. After the initial drop, the maximum acceptable leakage rates per minute are 3 psi for single vehicles and 4 psi for combination vehicles. If the leakage rate is higher, check for leaks and correct them.