I slathered Disc Quiet on the back of the pads both times i changed them, helped none. Matter of fact, when I changed the pads the second time, the Disc Quiet was still there on the old pads, so Im pretty sure thats not the source, or else it would have worn through making metal to metal contact.
The double hose is interesting, but even if it traps pressure against the caliper, how would this cause squeal?
My only option is to try the ceramic or organic pads I guess.

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1984 300D Turbo