In an emergency, the vacuum brake is used to stop , the high speed train. How does this vacuume brake work?

In an emergency, the vacuum brake is used to stop , the high speed tra

1.	In an emergency, the vacuum brake is used to stop , the high speed train. How does this vacuume brake work?
Answer» Solution :Steam at high pressure is made to enter the CYLINDER of vacuum brake. Due to high VELOCITY, pressure decreases in ACCORDANCE with Bernoulli’s principle. Due to this decrease in pressure, the piston gets lifted. CONSEQUENTLY brake gets lifted.