What is the maximum air leakage rate with the engine stopped and air pressure at governor cut out for a static test?

The maximum air leakage rate with the engine stopped and air pressure at governor cut out for a static test is crucial for ensuring the integrity and safety of the air brake system in commercial vehicles. According to federal and state regulations, when conducting a static air leakage test, the standard is typically set to a specific rate to ensure that the air brake system maintains sufficient air pressure for operation.

The correct answer highlights that the maximum allowable leakage rate is 2 PSI per minute only when the brakes are applied. This specification is important because when the brakes are engaged, the system is under load, and it is necessary to ensure that it can maintain pressure effectively even under these conditions. Excess leakage could indicate potential failures or weaknesses in the brake system, which could compromise vehicle safety.

Establishing this parameter is part of routine safety inspections and helps to assure that vehicles can stop effectively and are compliant with safety regulations. It is consistent with commonly accepted standards for vehicle inspections and maintenance, emphasizing the critical nature of not only testing under static conditions but also considering the operational demands placed on the braking system when brakes are applied.

The other options, while they provide different leakage rates, do not align with the specific condition of brakes being applied in the context of this testing scenario, making them