Could squealing noise when braking be caused by pad wear indicator engaged?

Most pads have a small metal tab that contacts the rotor when the pad is thin — making a high-pitched squeal.

Could squealing noise when braking be caused by glazed pads or rotors?

Overheating can glaze the friction surface, causing squealing without true wear.

Light squealing in the morning that goes away after a few stops is usually surface rust burning off.

Severity is rated Medium. Inspect pad thickness within the next week. If under 3mm, replace soon. If thicker, monitor for grinding (which is urgent).

Squealing usually signals that brake pads are nearing the end of their life.

Severity: Medium

Inspect pad thickness within the next week. If under 3mm, replace soon. If thicker, monitor for grinding (which is urgent).

Pad wear indicator engaged: Most pads have a small metal tab that contacts the rotor when the pad is thin — making a high-pitched squeal. Shop brake pads
Glazed pads or rotors: Overheating can glaze the friction surface, causing squealing without true wear. Shop brake pads
Dust, rust, or debris: Light squealing in the morning that goes away after a few stops is usually surface rust burning off. Shop brake cleaner