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What causes squealing noise coming from right wheel when driving over 30 mph and then grinding upon braking a 1999 Sentra?

There are a few potential causes for squealing and grinding noises coming from the right wheel of a 1999 Sentra:

1. Brake pads: Worn-out brake pads can cause a squealing noise when they rub against the brake rotors. If the noise is accompanied by a grinding sound, it could indicate that the brake pads are worn down to the metal backing plates, which can damage the rotors and cause further problems.

2. Brake rotors: Warped or damaged brake rotors can also cause squealing and grinding noises. Warping can occur due to overheating, which can happen if the brakes are used heavily or if the vehicle is driven in wet or icy conditions.

3. Wheel bearing: A worn-out wheel bearing can cause a variety of noises, including squealing, grinding, or growling. If the noise is accompanied by a vibration or if the wheel feels loose, it could indicate a problem with the wheel bearing.

4. Driveline: In some cases, a squealing noise from the right wheel could be related to a problem with the driveline, such as a faulty driveshaft or CV joint. These issues can also cause vibration or a loss of power.

To identify the exact cause of the noise, it is recommended to have the vehicle inspected by a qualified mechanic. They will be able to diagnose the problem and recommend the appropriate repairs.