96 Cavalier Z24 front driver side noise

We are looking into getting a 1996 Cavalier Z24.Could someone tell me what would cause the Driver side tire to make a thumping sound?It is not the tire :shakehead It sounds as if there is a knot on the tire but there isnt the tires are new.The sound is really loud but it doesnt seem to affect the steering you can let go of the wheel and the car still drives perfectly straight just is very noisy.

TY
Stacey

forgot to mention the ABS and Brake lights both are on

wheel bearing or upper strut plate and seat