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

DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life
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 4 fluids have a lower boiling point than DOT 3 fluid

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Automobile Engineering in ME
The rigid suspension is beneficial when

It is desired to reduce the unsprung mass
It is desired to improve tyre to ground contact characteristics
Large changes in load make it necessary to have a large suspension stroke
It is desired to have more flexibility in design

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