A combination vehicle with air brake system with the engine off and brakes released, should not lose more than:
Answer: 3 PSI (Rule: If your brakes are applied or being used, add 1 PSI)
Answer: 3 PSI (Rule: If your brakes are applied or being used, add 1 PSI)
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.