I just replaced the brake disk on my 88 560sel. All went well for the first 3 or so days when yesterday, I started to hear a "harmonic tone". The tone went away went I applied the brake - so it appeared. Since I had new calipers ready to install I proceeded to do that and completed last night. the "tone" is still there???? Does anyone have a clue what may be producing this tone? The disk were installed for three or more days BEFORE the tone appeared but I can't help but think the tone and the disk are related. The tone gets louder with time and less noticable the slower one travels. Thanks for considering an answer!

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Woody