Automobile Engineering in ME
The brake warning light warns the driver of

Failure of the primary or secondary circuit of hydraulic system
Air in the hydraulic system
Power brake failure
Water in the master cylinder

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Automobile Engineering in ME
The function of a second ring is that it is a

Back up oil control ring which will work in place of the bottom ring when it is broken
Compression ring and aids the top ring in sealing and cooling
Back up compression ring which will work in place of the top ring when it is broken
Cushion ring which prevents piston slap and knock

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