Whether a 1998 Chevy has disc brakes depends entirely on the *model* of Chevy. Some models in 1998 had disc brakes on the front only, some had disc brakes on all four wheels, and some may have had drum brakes on all four wheels (though this was less common by 1998).
To know for sure, you need to specify the *exact make and model* of the 1998 Chevy (e.g., 1998 Chevy Silverado 1500, 1998 Chevy Cavalier, 1998 Chevy Tahoe, etc.).
