Question about 2003 BMW 325

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Brake noise I own a 2003 BMW 325i when I apply the brakes I get a hissing sound like air under the dash right above the brake pedal. When the vehicle stops completely and I am still appling the brake the noise goes away. What can that be?

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Replace the master cylinder bleed valve

Posted on Jun 23, 2009

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2003 toyota what is the noise coming from the brake booster


Could be a air leak,check for hissing noise under dash brake pedal area.

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1996 Buick Park Avenue Ultra making a hissing noise when I press Brake Pedal. Have to Press super hard to stop or slow down.


Sounds like a possible air pocket in the braking system. Do you know how the bleed the brakes? They may need to be bled. Also, if you've added brake fluid recently, and didn't put the cap back on, it could create a suction. Another note is to check the cap to the brake fluid reservoir. It's rare, but, it could be bad.

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yes but up to a point
the brake pedal should move about 1" to take up the pedal free play and then be applied smoothly as you press further
the harder you press the more solid stopping action you will get
that way you can feel the brakes working so that you can adjust the braking action for stopping
there should be no hissing noise that occurs when the brakes are being applied
you say hydro booster which is hydraulic booster but a hissing noise will come from an air leak in a vacuum brake booster which indicates that it needs repalcing

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There are 2 things that can use vacuum near the brake pedal. If you have cruise control, there is a safety switch on the pedal to shut off the curise when you apply the brake. This switch may be leaking.
The other part is the brake booster, which is actually in the engine compartment but bolts to the firewall, and your brake pedal mechanism pushes into the booster. You will need to get your head under the dash with the engine running and press on the pedal to locate the leak--on the switch or on the wall.

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Yes sound like brake booster. most of time when booster is going bad makes hissing sound when brake applied.But should not make any kind of air leakage noise at all.Replace brake booster.Hope this was helpful for you.

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The power brake booster has a bad valve. I can't suggest where to find a new valve for it, but you can buy a rebuilt replacement. They are usually not hard to put on.

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Well, now being 60, might be a bit of a challange for me , but if I had to..... anyway dress comfortably, push the front seat back as far as you can. Now lay on your back looking up UNDER the L/S of the dash where you hear the noise and LOOK. for something loose. Open the hood, look for something loose under the L/S of the windhield. Nothing to lose. Hope this helps

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