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

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

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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
Mixes fuel with air
Returns blow by gases from the crankcase to the intake system

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