Automobile Engineering in ME
The function of oil control rings is that it

Lubricates the cylinder wall by releasing oil from its hole
Maintains a seal and prevents escape of burned gases and oil leakage
Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan
Keeps the cylinder wall lubricated by holding oil in its channel

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Automobile Engineering in ME
In a ventilated disc brake

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

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