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

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

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

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

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