While back, at my mechanic's recommendation, I had him "un-freeze" my front brake calipers. Since then, my pride-and-joy became a major embarrassment at every stop because front brake squeal. I have brought it back to him many times to no avail. Finally, last weekend, I pulled my right front pads off its caliper for a look-see.

I found one thing that I am not sure what to make of it. When I look at the outer piston, it has on its face a raised ring with a raised center. But 1/3 of the ring appeared to be lower than the rest of the ring. Is it the way that the pistons are suppose to be?

I then looked at both pads. They appeared to have a "C" and a center dot imprinted on their sides matching the face of their pistons. However, one has the opening of its "C" to the top while the other has the opening to the front.

That night, I found the article on Pelican Parts website on caliper rebuild: http://www.pelicanparts.com/techarti...er_rebuild.htm

The article says: "Orient the piston at a 20-degree angle from the top of the brake pad slot in the caliper. This angle is important to keep the brakes from squealing."

I don't have a copy of the factory manual. The orientation of the piston, is it referring to the opening of the "C"?

If yes, it appears my pistons are not oriented correctly. Do I need to rebuild both calipers to correct the squealing problem, or is there any other option?

Many thanks in advance.