Car grinding when braking
The buyer question: "car grinding when braking"
Treat grinding brakes as urgent. Stop driving if braking is weak, the pedal feels soft, the car pulls, stopping distance changes, or smoke or a strong odor appears.
What could cause it
More than one problem can cause the same symptom. These are places to inspect, not a diagnosis.
- Brake pads worn through their friction material
- A damaged or contaminated rotor or drum
- A sticking caliper or brake hardware issue
- A wheel, bearing, or foreign-object problem that sounds like brake grinding
Safe things to check
Keep clear of moving parts, hot components, and traffic. Use the owner's manual for vehicle-specific instructions.
- Notice whether the grinding occurs only when the pedal is pressed or also while coasting
- Look for warning lights and a damaged tire from outside the car
- Do not touch wheels or brake components after driving because they may be hot
Do not drive a car with grinding brakes unless a qualified professional has assessed it and told you how to move it. Towing may be safer.
What a mechanic may check
A technician may measure pads and rotors, inspect calipers and hardware, check wheel bearings and tires, and test braking force at each wheel.
If you are considering this car
Do not rely on a seller's promise that the brakes were recently serviced. Ask for an invoice and an independent inspection before considering the car.
Questions for the seller
- When did the grinding begin, and does it happen in reverse or only forward?
- When were the pads, rotors, calipers, or brake hardware last replaced?
- Will the seller allow a written brake inspection before purchase?