How do you replace the master cylinder on a 1999 Oldsmobile aurora?

To replace the master cylinder on a 1999 Oldsmobile Aurora, first, ensure the vehicle is on a flat surface and the engine is off. Disconnect the battery, then remove the brake fluid reservoir cap and drain the fluid. Unbolt the master cylinder from the brake booster, disconnect the brake lines using a line wrench (be cautious of any remaining brake fluid), and remove the old master cylinder. Install the new master cylinder, reconnect the brake lines and battery, and refill the brake fluid, bleeding the brakes to remove any air from the system.