Automobile Engineering in ME
The main function of the tread pattern on tyre is that

The tread pattern protects the tyre's inner carcass from small stones and pieces of glass
The crests between the tread grooves absorb road noise
In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating

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Automobile Engineering in ME
The main function of a master cylinder is to

Convert brake pedal force into hydraulic pressure
Ensure that all the wheel brakes are supplied with the same amount of fluid pressure
Adjust the extent of brake pedal free play
Boost the force applied to brake pedal

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