There are three Technical Service Bulletins (basically info from the manufacturer to mechanics about known problems and their fixes) for Brakes for 1999 Camrys, none seem to be a match for your problem though. The mechanic you talked to may just be thinking in general about brake problems, or there just haven't been enough problems like yours to warrant a TSB.
I would try changing the brake pad and see if it helps. If not, it may be a warped rotor.
Good luck and please share the solution if you find one.
TECHNICAL SERVICE BULLETIN: MFG Bulletin Number: BR00199
MFG Bulletin Date: 990401
Component: BRAKES:HYDRAULIC SYSTEM
Details: NEW FRONT BRAKE PAD KITS ARE AVAILABLE TO REDUCE FRONT BRAKE GROAN OR GRINDING NOISE ON VEHICLES WITHIN CERTAIN VIN RANGES.
MCS Check Date: 20020528
Check to Include on Custom Report TECHNICAL SERVICE BULLETIN: MFG Bulletin Number: BR00499
MFG Bulletin Date: 990701
Component: BRAKES:HYDRAULIC:SHOE AND DRUM SYSTEM
Details: SUBJECT REGARDING REAR BRAKE DRUMBS AVAILABLE TO REDUCE REAR BRAKE DRUM HOWLING / GROANING NOISE ON NAP BUILT CAMRYS.
MCS Check Date: 20020528
Check to Include on Custom Report TECHNICAL SERVICE BULLETIN: MFG Bulletin Number: 032999
MFG Bulletin Date: 19990329
Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS
Details: BRIEF INFORMATION REGARDING FRONT BRAKE NOISE. *TT
MCS Check Date: 19990602
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