Where do buy the backing pads from? Online I only see them from foreign ebay sources, are they not used in the US?
Do you place them under or on top of the shim? There isn't much room there to begin with in the caliper to increase the thickness of the pad.
I installed some Centric Posi-Quiet Ceramic pads and they are good after an initial test.
I also have my trusted ones, StopTech Street Performance. Those are silent and provide excellent friction but they are unbelievably dusty.
I have Akebono in the rear and they are silent so its disappointing that they make noise up front.
I also tried the oem Mercedes ones but surprisingly they squealed louder than I could imagine. I have been messing with brakes for many years so I know most of the tricks including different lubes, pastes and shims, bedding or chamfering the pads on a bench. Nothing has worked for the noisy ones.
Sometimes it's just a chance combination of the pad formula, rotor and caliper that will or will not produce an audible harmonic.
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