Automobile Engineering in ME
The power source for a brake booster is

Hydraulic pump
Exhaust manifold pressure
The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold
Electricity

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

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

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