SO heres the story ive replaced all my brakes calipers etc and now keep hearing this squealing from up there
when i go right its not as loud but when i go left its silent and gone
i think a couple of my brake lines are leaking and i heard if they do when you release your brake pedal it sucks air in and commonly wont releive the caliper piston closest to the master cyl i cant stand this noise HELP ME WHAT COULD IT BE

 

On the back of disc pads is supposed to be a thin metal anti-squeal pad.
If fluid is not leaking, the pads may need checking.

Sometimes the old anti squeal thin pads must be used if new disc pads did not come with them.
Pry them off with a thin screw driver.
also......
There is a small package of anti-squeal disc brake "goo" available at autoparts stores.
Smear it in the area of the thin anti-squeal pad that contacts the caliper piston and where
ever else the directions say to put it.

If that doesn't stop the squeal, post up again. Thanks.-Bob

 

A further thought.....
Some calipers have long bolts that the caliper slides on as the brakes are depressed and released,
and they require lubrication.............being careful not to get any lube on the pads or on the disc/rotor.-Bob

Let us know what you found that works to solve the problem.