What happens if the automatic brake valve is not cut out during a Brake Pipe Leakage test?

What happens if the automatic brake valve is not cut out during a Brake Pipe Leakage test?

• A. The Pressure Maintaining Feature will continue to maintain against leakage
• B. The test will pass automatically
• C. The train becomes unresponsive
• D. The readings will be zero

Answer: (A)

The automatic brake valve has a Pressure Maintaining Feature that keeps brake pipe pressure from falling when there is leakage. If you don’t cut out the valve during a Brake Pipe Leakage test, that feature stays active and automatically replenishes pressure to counteract the leak. In other words, the system holds the brake pipe pressure steady rather than allowing it to drop, so the test result reflects pressure maintenance against leakage.

The automatic brake valve has a Pressure Maintaining Feature that keeps brake pipe pressure from falling when there is leakage. If you don’t cut out the valve during a Brake Pipe Leakage test, that feature stays active and automatically replenishes pressure to counteract the leak. In other words, the system holds the brake pipe pressure steady rather than allowing it to drop, so the test result reflects pressure maintenance against leakage.