I had the same problem I switched to Lyndall pads and cleaned the pistons. The noise stopped and the the pads do not stay in constant contact with the rotor any more either.

 

So, how do you safely clean the pistons? Procedure??

 

It is in a small plastic bottle.. has the initials NF at the top and says "Disc Brake Squeal Silener".
The bottom of the bottle says, "The Noise Free Company".

It is not glue but it sets up and holds the pads to the cylinders. Removing the pads was no problem.

 

You can also go into a car part store and at the counters they will have little packets. Look for one called barke grease, and make sure it is the one that goes behind the pads. This holds the pads to the pistons and stops the noise and leangthens the wear time.

 

Go tho the lyndall Racing Brakes Web site. They have a step by step procedure for cleaning the pistons. It's easy.

 

I also forgot to mention that I lubed the brake pistons and the pin that holds the pads with Versilube. This is what the HD manual specs. The only problem is that this stuff is hard to find. I think it may come with some brake kit that HD sells. I found mine on line. I had to buy a 8oz. tube around $30.00.