If you apply the brakes and it stops, it's time for new brake pads, its a warning mechanism to let you know your brake pads are getting low kind of like a curb feeler but reversed.
There might be a squeaking noise when driving slow in your 2000 Beetle because your suspension needs to be replaced. The squeaking can also come from the universal joint.
Sometimes things such as sand will get into your brakes and cause the squeaking noise. In other instances, it might something mechanical beginning to fail. Regardless of the cause, if the noise continues you should see your mechanic!
Check your ball joints and your spring hangers
loose belts
One thing thing that can cause a squeakingÊ noise with each revolution of a tire is new rim brakes. Bad universal joints may cause the squeaking noise or the back plate may be rubbing on the rotor.
Your Axle
ball joints upper and lower control arm
check tension on fan belt(s)
yes lemming did a squeaking noise
ummm power steering
ball joints or tie rods
it could be a bad universal joint.