Symptoms
- High-pitched squeal or chirp when pressing the brake pedal
- Noise often goes away or changes once the car is moving faster
- May be worse first thing in the morning or after rain
Likely causes
- CommonBrake pad wear indicator contacting the rotorA small metal tab is built into many pads to squeal on purpose once they're worn down.
- CommonBrake dust or road grime buildupDust and debris between the pad and rotor can cause a temporary squeal.
- PossibleGlazed brake pads from overheatingHard, repeated braking can harden the pad surface and cause noise.
- PossibleCheap or low-quality aftermarket padsSome pad compounds are just noisier by design, especially when cold.
- Less commonWorn pads down to the metal backingIf squealing turns into grinding, pads may be worn through.
What to do
- Check pad thickness through the wheel spokes if you can see the caliper and pad clearly.
- Note if the squeal happens only on the first few stops of the day or all the time.
- Have the wheels cleaned of built-up brake dust with a hose or brake cleaner.
- Listen for a change from squealing to grinding, which would mean more urgent wear.
- Have a shop measure pad thickness on all four wheels if you're not sure.
- Replace pads if they're thin, and have rotors resurfaced or replaced if scored.
- Consider a different pad compound (ceramic vs semi-metallic) if noise continues with healthy pads.
Tools and parts
Brake padsSearch: “brake pads for your car make and model”
When to call a pro
See a mechanic if squealing turns into grinding, or if pad thickness looks low, since worn-through pads can damage rotors.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.