How do you change brake master cylinder on 1999 landrover discovery?

To change the brake master cylinder on a 1999 Land Rover Discovery, first, ensure the vehicle is on a flat surface and the engine is off. Disconnect the negative battery terminal, then remove the brake fluid reservoir cap and siphon out the fluid. Disconnect the brake lines from the master cylinder, unbolt the cylinder from the brake booster, and replace it with the new unit. Reconnect the brake lines, refill the reservoir with brake fluid, and bleed the brake system to remove any air.