Automobile Engineering in ME
In a ventilated disc brake

Disc contains many small holes for optimum cooling performance
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

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Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

The vertical size of the suspension can be made more compact
The assembly is slightly more complicated in design
Non vertical external forces are supported by the suspension arms
The unsprung mass in lighter

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