Automobile Engineering in ME
The difference between DOT 3 and DOT 4 brake fluids is

DOT 4 fluids have a lower boiling point than DOT 3 fluid
DOT 4 fluid is more resistant to freezing than DOT 3 fluid
DOT 4 fluids have a higher boiling point than DOT 3 fluid
DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life

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

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

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