Automobile Engineering in ME
In a ventilated disc brake

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

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Automobile Engineering in ME
A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

Allows the steering wheel to be turned by a greater amount when steering
Reduces the amount of kickback for large steering angles
Makes the steering more responsive
Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion

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

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

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