Which method is effective for detecting air leaks in the brake system?

Detecting air leaks in the brake system is crucial for ensuring safety and the effective functioning of air brakes. Listening for hissing sounds is a reliable method for identifying air leaks because the escaping air creates a distinct noise that indicates a problem. When air escapes from the brake lines or components, it often produces a hissing or whistling sound, making it easier for someone conducting a pre-trip inspection or maintenance check to locate the source of the leak.

In contrast, measuring tire pressure does not provide information about the brake system's integrity. Tire pressure is unrelated to brake air leaks and focuses solely on the condition of the tires. Assessing steering responsiveness, while important for vehicle safety, is also not directly linked to air brake functionality or the presence of air leaks. Lastly, inspecting engine coolant levels pertains to the engine's cooling system and has no relevance to the brake system or identifying air leaks. Thus, listening for hissing sounds is the most effective method for detecting air leaks in the brake system.