After driving my '99 Passat (90k miles) at high speeds (up to 125 mph) for almost an hour, the car made a grinding noise while braking. At first I expected worn out brakes but everything looks fine. Since then, whenever I drive over 120 mph, even if it is for less than a few minutes, there will be a grinding noise while braking. After I drive the car for about 4 hours at speeds between 80 and 100 mph, no sounds while braking. Does anyone here have an idea if this is common for Passat's and what causes the grinding noise.
Thanks in advance!