Grinding is almost never something to drive on. Metal-on-metal contact tells you a part has worn past its service limit. The location and trigger of the noise narrows it down fast.
Pads worn to the metal backing grind on the rotor. Often gets worse when braking. Continued driving destroys the rotor too.
A constant grind or rumble that gets louder with speed and changes when you turn left vs right. Test by turning at speed - load shifts to the bad side.
Grinding or clicking when turning, especially at low speed in tight turns. Check the inner CV boot for splits and grease spray.
Grinding from the engine bay, often paired with battery warnings, points to alternator bearings or a seized accessory pulley.
Grinding when shifting (especially into 1st, 2nd, or reverse) means worn synchronizers or a clutch that is not fully releasing.
You hear grinding from a wheel - the bearing or hub can seize and lock the wheel. Brake grinding means metal on metal, which can lock or fail the brakes entirely. Tow rather than drive long distances.
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No - wheel bearings, CV joints, and accessory belts grind too. Brakes grind only or mostly when stopping. Bearings and CV joints grind continuously or with speed and steering input.
Days to weeks at light load. The risk is sudden seizure - a locked wheel at speed can lose control. Replace within a week of first noise.
Cold-thickened grease, condensation on rotors (surface rust), or hardened rubber bushings. If it disappears after 1-2 minutes of driving, it is normal-ish - but bearings can also start this way.
Yes - especially in automatics. Grinding shifts, slipping, or lurching all point to fluid problems. Check the dipstick (where equipped) before driving more.
Yes - within a few hundred miles of metal-on-metal you score the rotor and have to replace both pads and rotors. Catching it on the squeal stage saves $200.