What causes the squeaking noise when starting the Audi Q3 with brake pedal pressed?

[DeJune]

Audi Q3's squeaking noise when starting with the brake pedal pressed is mostly due to worn brake pads causing the backing plate to grind against the brake disc, hard brake pads, or foreign objects lodged in the brake pads. Therefore, when brake noise occurs, first check the thickness of the brake pads. If the thickness is normal, stomping on the brakes a few times might alleviate the noise. Break-in period for new cars: The break-in of brake pads is a crucial part. Typically, after driving a few hundred kilometers, the brakes will feel more comfortable. Newly replaced brake pads: Newly replaced brake pads also need a break-in period to better integrate with the old disc. Initially, the brakes may feel very hard, and it usually takes a few hundred kilometers of driving before they feel better. Friction-induced noise: Very fine sand particles may get between the pad and the disc, sometimes causing noise due to friction. This situation generally doesn't require repair; driving for a while to let the small particles fall out should resolve it.