What is the maximum leakage rate for a combination vehicle with the brakes on?

The maximum leakage rate for a combination vehicle with the brakes on is established to ensure that the air braking system remains safe and reliable. A leakage rate of 4 PSI per minute is considered acceptable because higher rates could indicate a malfunction or issue in the brake system, which can compromise braking effectiveness and vehicle safety.

Ensuring that the leakage rate does not exceed this threshold helps to maintain sufficient braking power and responsiveness, particularly in emergency situations where quick stopping is crucial. Regular checks of the air brake system are essential for avoiding potentially dangerous situations caused by brake failure due to excessive air loss. Understanding this standard is vital for any commercial driver's safety and compliance with regulatory requirements for operating combination vehicles.