Hi:
If the brakes are spongy, the master cylender is full, and there are no leaks, I need you to check a couple things. First, when you bled the brakes, did you start at the wheel furthest from the master cylender and work your way to the closest? Next, have you adjusted the rear brakes? Also, are the rubber brake hoses on the front brakes in good condition and not expanding when you use the brakes?
As far as the hight pitch squeal, check the front brake pads first. The brake sensor may be touching causing the noise. If so, replace the pads.
I hope this helps. If you have any other questions, let me know.
Joe
Positive feedback is appreciated.