What is the required pounds per square inch for air brakes on every B-C-D vehicle?

The correct answer indicates that the required pounds per square inch (PSI) for air brakes on every B-C-D vehicle is 60. This specification is essential for ensuring that the braking system functions effectively and safely. Air brakes rely on compressed air to operate, and maintaining the correct PSI is crucial for adequate brake response and to prevent brake failure.

If the PSI is too low, the brakes may not engage properly, which could lead to increased stopping distances or even the inability to stop the vehicle entirely. 60 PSI ensures that the braking system has sufficient pressure to activate the brakes reliably under various operating conditions. Understanding this requirement is critical for any driver operating vehicles with air brake systems, as it upholds road safety and regulatory compliance.