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

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
An excessively high engine speed on a downhill road

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Automobile Engineering in ME
An imbalance wheel during vehicle operation

Creates a standing wave
Deflects in the vehicle's longitudinal direction
Makes large noise when its heavy point hits the road surface
Bounces vertically or deflects from side to side (as seen from front or rear)

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