Brake Noise: Squeal vs Grind — What Is the Difference?
Brake noises range from harmless and transient to a metallic grind that means danger and accelerating damage — knowing the difference protects you and saves money.
A light transient squeal
In the morning/when damp or on the first stops, usually moisture or surface dust that clears — typically not a concern.
A constant squeal
Many brake pads have a metal "wear indicator" that squeals as the pad nears its end — a sign the change is due soon. See the brake pads guide.
A metallic grind (dangerous)
A metal-on-metal sound means the pad is fully gone and the rotor is wearing — stop delaying; the repair gets pricier every day.
FAQ
Grinding only when braking?
Usually a finished pad eating the rotor — inspect immediately before rotor damage.
Squeal without braking while driving?
May be the wear indicator constantly touching (a near-finished pad) — the change is due soon.