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FIBA

It is a safety device used in passenger coaches with air suspension that automatically applies the brakes if the air suspension system fails, preventing unsafe operation. 

Why FIBA is Needed — Safety Purpose

Air-sprung coaches use compressed-air bellows (air springs) for suspension. If an air-spring fails or leaks (bellow rupture or pressure loss) for any reason — due to damage, wear, leak — that bogie becomes unsafe. The coach may tilt, derail or produce instability at speed. Hence, FIBA acts as a fail-safe.

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