When should the vacuum gauge be in view for the driver?

The vacuum gauge should be in view for the driver at all times while driving. This is crucial because the vacuum gauge provides essential information about the performance of the vehicle’s braking system. A consistent observation of the gauge allows the driver to monitor the brake system's effectiveness and respond proactively to any changes that could indicate a potential issue.

By having the gauge in view continuously, the driver can ensure that the brake system maintains adequate vacuum levels, which are vital for proper brake function. If there were fluctuations or lower readings, the driver could address the problem before it leads to a brake failure or an unsafe driving situation. This proactive monitoring aligns with best safety practices, ensuring that the vehicle remains in optimal operating condition throughout the duration of the drive.