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 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

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Automobile Engineering in ME
The function of anti-lock brake system (ABS) is that is

Minimizes the brake fade
Maintains directional control during braking by preventing the wheels from locking
Prevents nose dives during braking and thereby postpones locking of the wheels
Reduces the stopping distance

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

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

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