Answer :

Final answer:

An air brake system is fully charged at 125 psi, which is essential for the safe operation of heavy vehicles as it ensures effective braking. Therefore the correct option a.

Explanation:

An air brake system is fully charged at 125 psi. This pressure is the standard at which most commercial vehicle air brake systems are considered fully charged and ready for operation. Air brake systems are crucial for the safe operation of heavy vehicles, as they use compressed air to apply pressure to the brake pad, slowing down the vehicle. It's important to maintain this pressure to ensure that the vehicle can stop effectively.

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Rewritten by : Barada