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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Automobile Engineering in ME
The ball joints are used on the tie rod ends, because they

Reduce the amount of sliding resistance
Reduce the amount of noise generated
Can deal with movement of the suspension both vertically and in other directions
Improve the force transmission speed

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