[s-cars] Big Red question

[Djdawson2 at aol.com]

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All,
I installed my Big Reds onto my S4 this weekend.  I had used them on my 20v
200, and loved the upgrade.  One problem.... outrageous squeal.  I had the
same issue with Textars, and it persisted until the pads were roughly 1/2
gone.  Then it stopped.  However, Textars are something I would prefer not to
deal with, as they are SO dirty.  It took me hours to clean up my wheels.

So, upon install onto my S4, I used a different pad, along the lines of a
metalmaster.  I was hoping to do away with both squeal and dirt.  The squeal
is still unbelievable.  I sound like a semi pulling up to a light.

Anyone discovered a solution?  I'm thinking this is a resonance between the
backing plate and the caliper.  Anyone tried shims?

Any help greatly appreciated.
Dave