The best stuff I ever used to stop ALL squeel is a product made by bg. Its a liquid that goes directly on the pad surface and is absorbed in. Stops squeeling cold. I had my '79 that was embarassing to drive untill I used this stuff.

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1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair