During Brake Pipe Leakage Method, after the signal is received, the procedure requires reducing pressure by how many psi?

During Brake Pipe Leakage Method, after the signal is received, the procedure requires reducing pressure by how many psi?

• A. 20 psi
• B. 15 psi
• C. 25 psi
• D. 10 psi

Answer: (A)

Brake pipe leakage testing uses a controlled, small decrease in brake pipe pressure after the signal is received to check for leaks. The predefined drop is chosen so it is enough to reveal any leakage without fully releasing or unnecessarily activating the brakes. If the system maintains pressure within the allowed range during the observation period after that drop, the leak rate is acceptable; if the pressure falls beyond what’s permitted, it indicates a leak that needs attention. This approach provides a clear, repeatable way to verify the integrity of the brake pipe and its connections without causing a full brake application.

Brake pipe leakage testing uses a controlled, small decrease in brake pipe pressure after the signal is received to check for leaks. The predefined drop is chosen so it is enough to reveal any leakage without fully releasing or unnecessarily activating the brakes. If the system maintains pressure within the allowed range during the observation period after that drop, the leak rate is acceptable; if the pressure falls beyond what’s permitted, it indicates a leak that needs attention. This approach provides a clear, repeatable way to verify the integrity of the brake pipe and its connections without causing a full brake application.