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

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

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Automobile Engineering in ME
In a ventilated disc brake

Caliper is covered with cooling fins
A duct directs air towards the caliper for cooling while the vehicle is moving
Disc contains radial vanes between its rubbing surfaces for optimum cooling performance
Disc contains many small holes for optimum cooling performance

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