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

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
Overheating of the fluid due to frequent brake application

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Automobile Engineering in ME
The purpose of a balancer shaft is to

Increase inertia force of the rotating crankshaft
Balance the timing in the movement of the two groups of pistons
Adjusts the timing of the intake and exhaust valve openings
Reduce vibrations caused by the crankshaft rotation

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