Automobile Engineering in ME
The power source for a brake booster is

Electricity
Exhaust manifold pressure
Hydraulic pump
The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold

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Automobile Engineering in ME
The function of an oil control orifice is that it

Regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes
Turns oil into fine mist for spray lubrication
Returns cylinder head lubricating oil to the oil pan at high speed
Removes impurities from cylinder head lubricating oil

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