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

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

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Automobile Engineering in ME
The purpose of a balancer shaft is to

Balance the timing in the movement of the two groups of pistons
Increase inertia force of the rotating crankshaft
Adjusts the timing of the intake and exhaust valve openings
Reduce vibrations caused by the crankshaft rotation

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