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      12-08-2020, 01:45 AM   #2
Wanwansuii
Private First Class
United_States
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Drives: '14 BMW 640i Gran Coupe Msport
Join Date: Oct 2020
Location: Northern California

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This sounds like a failed or failing Brake Master Cylinder. On regular cars, it typically isnt an expensive fix. I'm not sure how it is on the M6.
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