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

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

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Automobile Engineering in ME
The composition of the electrolyte in a fully charged battery is that

The electrolyte is pure sulphuric acid
The electrolyte is pure distilled water
The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight

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