Cylinder Leaks/en: Difference between revisions
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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 | 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 upon 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 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. | 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. | ||
[[Category:Air Brake System|4]] | [[Category:Air Brake System|4]] | ||
Revision as of 15:25, 11 March 2025
Over time, air brake system components leak air. This includes the brake cylinders, thus they cannot be relied upon 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.