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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 01-28-2010, 07:24 PM   #1 (permalink)
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2002 325i brake pedal ouestion

when you mash the brake pedal you here a swishing air sound coming out from from under the dash, what could the problem be.
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Old 01-28-2010, 11:44 PM   #2 (permalink)
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I don't know, maybe your pushing way to hard and putting the pedal all the way through the floor?
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Old 01-29-2010, 12:52 AM   #3 (permalink)
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Is this new? I used to have the same thing on my E36 328i, but I don't recall if I ever did anything to change that or whether it ever went away. Check under the hood to ensure that the brake fluid reservoir cap is on tight.

Is there a lot of play on the brake pedal, or is it pretty stiff? Stiff is good. Spongy brakes are a sign of air in the system, which is fixed by flushing/replacing/bleeding brake fluid, but I may be looking at this whole thing from the wrong point of view
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Old 01-29-2010, 05:46 AM   #4 (permalink)
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what about the pressure switch would this cause this, the first thing people say is you have a air leek when they first hear this, it is that loud. No not mashing to hard!
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Old 01-29-2010, 06:47 AM   #5 (permalink)
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Either the master cylinder or the brake booster going.
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Old 01-29-2010, 07:40 PM   #6 (permalink)
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Brakes seem to be working fine, but i guiss it could be a brake booster
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