There is a slight bubbling sound on the passenger side, and brakes squeal but mechanic says the pads are pretty much brand new. How to fix?

 

for the squealing, you could try using brake lube/grease on the back of the pads and it might fix it

 

how to apply? just lube up? or take pad out and lube?

 

The splash guard for the rotors might be touching.

 

if you add the brake quiet stuff try to get the back of the pad where the caliper cylinders touches the pad also try not to get it on the rotors... add some onto where the 2 sits on the top & bottom fittings of the pads.

you do not need to remove the pad itself to get to it, just hang the caliper down and apply but turn the wheel a little to get to the inner pad.