Great thread and fix! I have noticed for some time now that the handbrake affects this noise and used to find that sometimes just lifting the handbrake briefly would sort this out for a while, but not a permanent solution and have not gone investigating like this.
But since my car was serviced at the beginning of the year the brakes have tended to squeal when braking rather than just the normal rear brake squeal when at low speeds off the brake pedal. So a few days ago this brake squeal really got to the point that I had to investigate and see what I could do.
Pulled the pads out only to discover what I had suspected all along, no anti-squeal paste used at all, bone dry and gritty with brake dust etc. Cleaned and applied a thin film of copper grease on the contact areas of the backs of the brake pads. Reassembled and it is definitely quieter overall. Have not heard the rear brake squeal since then also, but am pretty sure it will return and need me to do this thread's fix.
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BMW E90 330i (M) '05 (His) | (Hers) BMW E46 320i f/l (M) '03
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