What is the maximum leakage rate for combination vehicles?

The maximum leakage rate for combination vehicles is set at 3 psi in one minute. This standard is established to ensure that the air braking system in these vehicles maintains adequate pressure, which is crucial for safe operation. A leakage rate exceeding this limit may indicate a potential air system malfunction or leak, which can compromise the vehicle's braking performance and overall safety. Regulatory bodies enforce these standards to safeguard both the driver and other road users by minimizing the risks associated with impaired braking capabilities in heavy-duty vehicles. Keeping the leakage rate within these limits is essential for maintaining the integrity and reliability of a combination vehicle's air brake system.