Pads worn to the metal
The most common cause. New pads start around 12 mm thick. When the friction material is gone, the steel backing plate grinds on the rotor.
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Brake answers
What does a grinding noise when I brake mean?
The short answer
Grinding when you brake usually means the brake pads are worn through and metal is rubbing on the rotor. Don't put it off: every stop now cuts into the rotor, which turns a pad job into a pad-and-rotor job, and the car won't stop as well as it should. Light rust after the car has sat, or a stone caught behind the rotor, can grind too.
From the Budget Brakes shops · Updated
What causes it
Rust after the car sits
Rain, humidity or a few days parked leave a thin layer of rust on the rotors. A light grind for the first few stops that then goes away is normal.
A stone or debris
A small stone stuck between the rotor and its dust shield scrapes all the time, even when you're not braking. It's quick to clear, but left there it can score the rotor.
The ABS working
In a hard stop on a wet or icy road, the anti-lock brakes pulse fast and can sound like grinding. That's normal.
Worn hardware or a wheel bearing
Loose pad clips can rattle and grind. A worn wheel bearing growls or hums, gets louder with speed, and makes its noise without the pedal.
Squeal first, then grind
Many brake pads have a small metal tab that squeals when the pads get thin. That squeal is the early warning, and it's the cheapest time to come in. Grinding is what comes after it.
Is it safe to drive?
Not for long. Steady grinding when you brake usually means the pads are gone, and the car won't stop as well as it should. Drive gently, leave extra room, and go only as far as a shop.
If the pedal feels soft or sinks, or the red brake warning light comes on, don't drive it. Have it towed.
What it costs to fix
Caught early, it may still be just pads. The longer it goes, the more likely the rotors need replacing too, and sometimes the calipers. At Budget Brakes, lifetime warranty brakes start from $100, and the free inspection tells you exactly what your car needs, in writing, before any work starts. What a brake job costs.
More questions
Why do my brakes grind in the morning and then stop?
That's usually surface rust from overnight moisture. If it goes away after a few stops, it's normal. If it stays, have the pads checked.
Can grinding brakes damage the rotors?
Yes. Metal on metal cuts grooves into the rotor quickly, and a badly scored rotor has to be replaced.
Is grinding the same as squealing?
No. Squealing is usually the wear tab warning you that the pads are getting thin. Grinding usually means they're already gone.
Why do my new brakes grind?
New pads can make some noise for the first few miles while they wear in. Grinding that keeps going can mean a part isn't seated right or something got caught. Have it looked at; if Budget Brakes did the work, any of the sixteen shops can check it.
Your free brake inspection includes:
Worn outBrake pad thicknessBrand new
Measured, not guessed. New pads start around 12 mm. We start the conversation near 3 mm, and you see the number.
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