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

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

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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
Boost the force applied to brake pedal
Adjust the extent of brake pedal free play

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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
In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
The crests between the tread grooves absorb road noise
The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating

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