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I just wanted to update this thread. I swapped in some new Hawk HPS pads and Mazdatrix stainless steel brake lines on all four corners and flushed the brake system with some generic DOT4 fluid (Prestone, I think) and then bled it with a pressure bleeder. The noise I mentioned in the first post is now gone. I did notice the upper pad spring on the front driver's side is missing, the front shims were installed upside down by previous owner/shop (correct now) and the rear shims are missing completely, but I don't know if any of that has to do with anything.
That being said the brake feel still sucks. When the car is off I can pump them and they get nice and stiff, but as soon as the I start the car the pedal will slowly go to the pedal stop (not the "floor"). Based on this info, I'm with classicauto above; a bad master cylinder, so time to replace that next. Does anyone know how the AAS has anything to do with the MC? I see variants listed "with" and "without" AAS and/or ABS (I know I don't have ABS) but I don't know how it matters. The AAS has been removed/disabled on my car for a while now.
Also, does it matter on which side of the rotor the low pad squealers are located? I think stock has them on both sides but the Hawk's only have them on one. The previous pads had them on the inside of the rotors, which is where I put them, but given the information above, I have no idea if this is correct.
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