Cylinder Leaks/en: Difference between revisions

Revision as of 20:54, 9 March 2025

Over time, air brake system components leak air. This includes the brake cylinders , thus they cannot be relied on to keep the brake shoes applied indefinitely. This is why on parked vehicles a handbrake must be applied manually.

That said, if a train with a train brake applied contains a motorized vehicle with a self-lapping control valve and a functioning compressor , as long as the engine is running the pressure in all of the train’s brake cylinders will be maintained. This means runaways due to leaks won’t be possible. If the train, however, only contains a non-self-lapping vehicle doing the braking, pressure in the cylinders will not be maintained and can lead to a runaway, unless the brake handle is in the service position.

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-Brake cylinders aren’t perfect and leak air over time. Thus, they cannot be relied on to keep the brake shoes applied for too long. This is why on parked vehicles a handbrake must be applied.
+Over time, {{pll|Air Brake System Overview|air brake system components}} leak air. This includes the {{pll|Air Brake System Overview|brake cylinders}}, thus they cannot be relied on to keep the {{pll|Brake Shoes|brake shoes}} applied indefinitely. This is why on parked {{pll|Rail Vehicle Types|vehicles}} a {{pll|Handbrake|handbrake}} must be applied manually.
-That said, if a train with applied train brakes contains a motorized vehicle with a self-lapping valve and a functioning compressor, as long as the engine is running the pressure in all of the train’s brake cylinders will be maintained. This means runaways due to leaks won’t be possible. If the train, however, only contains a non-self-lapping vehicle doing the braking, pressure in the cylinders will not be maintained and can lead to a runaway, unless the brake handle is in the service position.
+That said, if a train with a {{pll|Train Brake|train brake}} applied contains a motorized vehicle with a {{pll|Lapping|self-lapping}} control valve and a functioning {{pll|Compressor|compressor}}, as long as the engine is running the pressure in all of the train’s brake cylinders will be maintained. This means runaways due to leaks won’t be possible. If the train, however, only contains a {{pll|Lapping|non-self-lapping}} vehicle doing the braking, pressure in the cylinders will not be maintained and can lead to a runaway, unless the brake handle is in the {{pll|Lapping|service}} position.
-{{See also|Air Brake System Overview|Lapping|Manual Cylinder Release|Monitoring|Train Brake|Independent Brake|Brake Shoes|Handbrake}}
 [[Category:Air Brake System|4]]