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Brake Pedal Whistle?


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#1 Nivag

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Posted 09 January 2008 - 04:04 AM

I have a weird noise that I can't isolate:

Car: 2001 V70 2.4 T auto

Happens when I press the brake pedal as I am slowing down... right after slowing or stopping when I lift off the brake pedal there is a "whistle/ long beeping" noise. It will even continue if I stop, lift off brake and turn car off it will still do it. If I tap or very light press the brake pedal it goes away. If I leave it to run it's coarse, it will last anywhere from 2-6 seconds and slowly soften and then go away.

Brakes are more than 50% left. The sound is coming from under the dash area and I think something to do with brake pedal.

????? anyone heard anything like that?
Gavin




#2 dmelviØØ7

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Posted 09 January 2008 - 04:37 AM

Could it be described as a hissing?

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#3 Nivag

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Posted 09 January 2008 - 04:48 AM

Definately not a hissing... The sound is inside the cabin and seems to be from down in the pedals. It sounds like a long soft beep noise... Closest analogy I can think of is if you took a hydraulic piston and pushed it in and as it slowly released itself it made a whistling sound as it slowly returned to its orig position???

#4 uscgc70

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Posted 09 January 2008 - 04:51 AM

I would say leaking brake booster. i've heard of some people having problems with them on these cars.
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#5 dmelviØØ7

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Posted 09 January 2008 - 04:53 AM

QUOTE (uscgc70 @ Jan 8 2008, 08:51 PM) <{POST_SNAPBACK}>
I would say leaking brake booster. i've heard of some people having problems with them on these cars.

Kinda what it sounds like to me too.

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#6 Nivag

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Posted 09 January 2008 - 05:52 AM

Thx guys, I will follow those leads tomorrow...

#7 MrWinkey

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Posted 11 January 2008 - 01:49 AM

I agree from the description ..you need the notorious booster. Drop the drivers side lower dash cover and put your hand up at the booster rod. Bet it's leaking or the seal has popped out. No you cannot put the seal back in reliably.
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#8 dmelviØØ7

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Posted 11 January 2008 - 04:41 AM

QUOTE (MrWinkey @ Jan 10 2008, 05:49 PM) <{POST_SNAPBACK}>
I agree from the description ..you need the notorious booster. Drop the drivers side lower dash cover and put your hand up at the booster rod. Bet it's leaking or the seal has popped out. No you cannot put the seal back in reliably.
dry.gif

Another classic swedish design smile.gif

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