Automobile Engineering in ME
The function of a radiator fan in the cooling system is that

It blows air through the radiator when necessary
It cools the engine by blowing air onto the cylinder block
It draws heat out of the engine compartment
It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump

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

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

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