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What is the maximum air loss allowed when testing the air-loss rate of the brake system on a tractor and trailer?

  1. 4 psi

  2. 6 psi

  3. 8 psi

  4. 10 psi

The correct answer is: 4 psi

The maximum air loss allowed when testing the air-loss rate of the brake system on a tractor and trailer is 4 psi. This means that during the brake system test, the air pressure should not drop more than 4 pounds per square inch. Options B, C, and D are incorrect because they exceed the maximum air loss allowed, which could indicate potential issues with the brake system that need to be addressed.