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

Reduces the stopping distance
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

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

DOT 4 fluids have a higher boiling point than DOT 3 fluid
DOT 4 fluid is more resistant to freezing 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 fluids have a lower boiling point than DOT 3 fluid

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