How do you replace the brake master cylinder on a 1998 Chevy cavalier?

To replace the brake master cylinder on a 1998 Chevy Cavalier, first, ensure the vehicle is on a level surface and disconnect the negative battery cable. Remove the brake fluid from the reservoir, then disconnect the brake lines and unbolt the master cylinder from the brake booster. Install the new master cylinder, reconnect the brake lines, refill the reservoir with brake fluid, and bleed the brakes to remove any air from the system before reconnecting the battery.