How is a faulty brake system usually indicated to the driver?

Answer: B — Major drops in air pressure and warning lights or alarms activating

A faulty brake system is typically indicated to the driver by major drops in air pressure and the activation of warning lights or alarms. This is crucial because the air brake system relies on maintaining a specific air pressure to function correctly. If there's a significant drop in air pressure, it signals that there may be a leak or malfunction within the system, which could compromise braking efficiency and safety. Warning lights or alarms are designed to alert the driver immediately about such issues, allowing them to take appropriate action, such as pulling over safely and inspecting the brake system. Recognizing these indicators is vital for ensuring the vehicle operates safely and conforms to regulatory standards. Other choices, while they may relate to vehicle operation, do not provide the specific and immediate feedback that directly pertains to the integrity of the brake system.