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

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

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Automobile Engineering in ME
The drive-shafts are connected to the differential and wheel hubs through universal joints because the universal joints

Absorb the vibrations transferred from the surface of the road
Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.
None of these
Absorb any difference in speed between the left and right wheels when the vehicle is turning

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