Automobile Engineering in ME
When the front wheels of a vehicle are locked during braking, then

Front tyres skid across the road surface, and the vehicle spins around
Driver loses control over the steering, and the vehicle continues moving in its current direction
Stopping distance becomes extremely long
Rear tyres skid across the road surface, and the vehicle spins around

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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
Overcooling of the brakes during high speed driving
Keeping the vehicle without use for an extended period
Overheating of the fluid due to frequent brake application

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