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

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

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Automobile Engineering in ME
It is necessary to maintain the valve clearances as they

Increase the speed at which the valves move up and down
Allow for lengthening of the valves owing to the heat of combustion
Reduce the resistance to sliding that occurs between the cam and the tappet
Make the crankshaft turn smoothly

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