I had this once on a c, deflecting front bearing. Allowed the rotor to contact the backing plate, repacked and reset bearing preload and the noise was gone.

Joe

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Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
919-881-0364