Hmmm. Ive never done this on a brake job. So just file down the area around the piston so its nice and smooth? I too am going to do a complete brake job on the SD this weekend. I bought some anti squeal paste but have never used it before. Do I just apply it on the back of the pad where it meets the piston? Thanks

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual