Thread: STrange Noise
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      04-27-2014, 07:13 PM   #6
SaNGRia
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Drives: LCI E93 M3 + F85 X5M
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Originally Posted by M3AG View Post
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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