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      03-14-2014, 11:41 PM   #1
SaNGRia
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STrange Noise

Hey Everyone. I do not understand where this sound comes from but it sounds exactly like side mirror folding or mirror adjusting . I drove 2 times today and it happened 2 times. I do not know what cause this problem but it is annoying. I would say passenger side mirror gets down when i put the reverse. But sound comes from behind the headlight switch. Does anyone know what is this? I am feeling like my front suspensions are auto leveling itself.
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      04-25-2014, 12:58 PM   #2
///Mangler
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Originally Posted by SaNGRia View Post
Hey Everyone. I do not understand where this sound comes from but it sounds exactly like side mirror folding or mirror adjusting . I drove 2 times today and it happened 2 times. I do not know what cause this problem but it is annoying. I would say passenger side mirror gets down when i put the reverse. But sound comes from behind the headlight switch. Does anyone know what is this? I am feeling like my front suspensions are auto leveling itself.
Same here being on the M3. Weird motorized noise from behind the headlight switch. Happens on start up.
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      04-26-2014, 12:28 AM   #3
M3AG
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Originally Posted by ///Mangler View Post
Same here being on the M3. Weird motorized noise from behind the headlight switch. Happens on start up.
I've noticed it as well...
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      04-26-2014, 12:53 AM   #4
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The car makes all sorts of sounds during startup and shutdown. It's normal.
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      04-26-2014, 06:45 PM   #5
M3AG
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Quote:
Originally Posted by SaNGRia View Post
Hey Everyone. I do not understand where this sound comes from but it sounds exactly like side mirror folding or mirror adjusting . I drove 2 times today and it happened 2 times. I do not know what cause this problem but it is annoying. I would say passenger side mirror gets down when i put the reverse. But sound comes from behind the headlight switch. Does anyone know what is this? I am feeling like my front suspensions are auto leveling itself.
The sound is from the brake booster pump pressurizing the brake fluid in the lines. The duration of the noise also changes with front brake pad wear/thickness. It's some sort of ABS test.
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      04-27-2014, 08:13 PM   #6
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The sound is from the brake booster pump pressurizing the brake fluid in the lines. The duration of the noise also changes with front brake pad wear/thickness. It's some sort of ABS test.
Thank you so much. It helped me a lot and also helps others
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      05-09-2014, 07:18 AM   #7
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The sound is from the brake booster pump pressurizing the brake fluid in the lines. The duration of the noise also changes with front brake pad wear/thickness. It's some sort of ABS test.
so what is it doing when it never stops? some days it just runs and runs and other days i never hear it?

T
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