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Old 07-27-2023, 03:19 PM   #9
ctrlz


 
Drives: 2017 2SS, 50th pkg, M6, MRC, NPP
Join Date: Jan 2016
Location: Ocean City, NJ
Posts: 3,578
Without much information, my guess is that your brake vacuum booster is making the noise. Possibly related to a leaky check valve.
I think the sound you hear may be the diaphragm moving quickly.
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