Squeaking or Grinding Brakes: What's Actually Wrong?
Not every brake noise means something's seriously wrong, but a few specific ones are worth treating as urgent rather than background noise, and telling them apart isn't difficult once you know what to listen for.
A high-pitched squeal
Most commonly this is a deliberate wear indicator built into the pad, designed to make exactly this noise once the friction material is running low. It's a genuine warning, worth booking a check soon, but it isn't an emergency in the way grinding is.
A grinding or growling noise
This usually means the brake pad's friction material is fully worn away and metal is now contacting metal, specifically the pad's backing plate against the brake disc. This is more urgent, since it means reduced stopping power right now, and it's actively damaging the disc every time you brake, turning a pad replacement into a pad-and-disc replacement.
A one-time squeak that goes away
Brakes that squeak once after sitting overnight, especially in damp weather, and then quieten down after the first few uses, is usually just surface rust or condensation on the disc, cleared off by normal use. This is harmless and doesn't need attention.
A clicking noise when braking
Can indicate a loose component, such as a worn pad clip or a loose splash guard, rather than the pad or disc itself. Worth a check, but not usually urgent unless it's accompanied by reduced braking performance.
When to stop driving and get it looked at immediately
Grinding, a noticeably longer stopping distance, a soft or spongy brake pedal, or the car pulling to one side under braking are all worth treating as urgent rather than something to fit in "when convenient."
Check a car's MOT history for brake-related fails or advisories before you buy.
Check MOT history