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what is the purpose of the vacuum pump???

Old 08-06-2010, 07:39 AM
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Join Date: Jul 2010
Posts: 13
Default what is the purpose of the vacuum pump???

so i began taking everything apart to pinpoint my buzzing noise after the car is off.. and i know its my vacuum pump but what is it doing???
i know its pumping vacuum, but why???? why do i need vacuum when the cars off???
this leads me to my main question.... does the booster need to have vacuum when the cars off????

if it does i need to replace that 3 way valve system.

and if anyones got alldata??? please can you find out about this whole system? PLEASEEE!!!!!!
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