IanH

My suggestion is to Change your brake pads for Nissan one where you get the set of anti squeal shims that you can only get from Nissan.
Or if you don't like that solution ask around for pads that don't squeak much.
To confirm its your pads you can remove them, clean with brake cleaner, chamfer the pad at the ends and maybe put a shallow grove in the middle. This will change the vibrations and either eliminate the squealing for a while or change the pitch.
Other non-likely things to check.
I assume this is not the brake pad wear squeakers ? this occurs when you are off the brakes. Check the pad thickness

Check that the dust shield is not rubbing the rotor.
Warped Rotors tend to grab as wheel rotates, and do not usually make a noise
Other than that does it change on left vs right turns ?

Good Luck.....

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1997 Sentra GXE .... SOLD
1997 S-ER 5 sp yea !!!
2003 Pathfinder SE 4WD
Ex- 2001 Sunny N16 RHD (N16 Nissan Bluebird Sylphy)