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
Prevents nose dives during braking and thereby postpones locking of the wheels
Reduces the stopping distance
Minimizes the brake fade

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Automobile Engineering in ME
The function of a second ring is that it is a

Compression ring and aids the top ring in sealing and cooling
Cushion ring which prevents piston slap and knock
Back up compression ring which will work in place of the top ring when it is broken
Back up oil control ring which will work in place of the bottom ring when it is broken

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Automobile Engineering in ME
The function of positive crankcase ventilation (PCV) system is that it

Promotes combustion by creating a swirling movement in the air-fuel mixture
Feeds blow by gases to the exhaust manifold
Returns blow by gases from the crankcase to the intake system
Mixes fuel with air

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