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

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

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Automobile Engineering in ME
The condition that causes vapour locking in a brake system is

Overcooling of the brakes during high speed driving
Keeping the vehicle without use for an extended period
An excessively high engine speed on a downhill road
Overheating of the fluid due to frequent brake application

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