Michigan CDL - Air Brakes Practice Exam

What is the maximum leakage rate for a single vehicle with air brakes during a static leakage test?

1. 3 psi in one minute

2. 1 psi in one minute

3. 2 psi in one minute

4. 5 psi in one minute

The correct answer is: 2 psi in one minute

The maximum leakage rate for a single vehicle with air brakes during a static leakage test is 2 psi in one minute. This standard is critical for ensuring that the air brake system is functioning properly and is capable of holding the necessary air pressure to operate safely. Understanding this leakage limit is essential because excessive air loss could indicate a failed component or a compromised system, which could lead to brake failure while driving. The set limit of 2 psi in one minute helps to maintain safety and reliability in air brake systems, ensuring that drivers are protected against sudden brake issues caused by leaks. Remaining within this leakage threshold is vital for the functionality of air brakes, especially since these systems rely on maintaining adequate pressure for effective braking performance. A leakage rate exceeding this limit would prompt a need for inspection and repair before the vehicle can be considered safe for operation.