How can you check for air leaks in the brake system?

Answer: B — Listening for hissing sounds or using a soap solution to identify leaks.

To check for air leaks in the brake system, it is essential to use methods that specifically target the identification of escaping air. Listening for hissing sounds is effective because it directly indicates air escaping from a faulty component or connection. Additionally, applying a soap solution to suspected areas can help reveal small leaks; the formation of bubbles in the solution is a clear sign of escaping air. This method provides a visual indication of leaks that may not be audible or easily visible otherwise. Inspecting brake pads visually does not indicate the presence of air leaks, as this method focuses on the condition of the friction material rather than the integrity of the air brake system. Checking fluid levels in the reservoir relates more to hydraulic brake systems than air brakes; air brakes typically use compressed air, so fluid levels do not provide information regarding air leaks. While using a pressure gauge can help monitor system pressure and performance, it does not directly identify air leaks unless followed up with other checks. Thus, utilizing sound and a soap solution is the most effective way to verify the presence of air leaks in the brake system.