Had this same exact problem. Except it wasn't the ebrake or a pebble...
this was something completely different lol
somehow my tpms broke off and was rolling inside the tire causing a cowbell noise.
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F80 M3
F32 435i - Daily
BMW e92 328i - SOLD /// ST V1 Coilovers /// BMW Performance Exhaust /// OSS Full Blackout /// LCI Tail Lights /// Volk Racing TE37 /// CPS Lip ///
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