Quote:
Originally Posted by tccox
OK, why would my 228 be squeak free for first 5500 miles, then start squealing like a stuck Pig. Only change has been a huge drop in outside temperature
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Unless it's a shifted pad which would most likely squeal when brakes are not applied or debris that would most likely squeal when brakes aren't applied- then the noise is either brake pad to rotor surface or pad vibration. Pad vibration is normally fixed by brake-pad paste between back of pad and brake piston.
Mercedes put out a bulletin saying not to use brake-cleaner on their rotors, that a type of emulsifier effect between pad & rotor dust along with brake cleaner causes a poor contact surface and potential noise.
Anyway some hard braking can sometimes clean the brake surfaces and eliminate noise. Leisure driving and cold temps, or a contamination of the brake pad matrix, debris?
Doubt a wheel bearing went bad and the bearing is metal to metal when the brakes are applied.
If it's just one axle you can run your fingernail across the front and rear axle disc surface to detect any obvious differences.