To check the brake system, depress the brake pedal multiple times with the engine off to ensure there is no change in the pedal reserve distance. Then, depress the pedal and start the engine, checking if the pedal goes down slightly, indicating normal operation. Next, disconnect the electrical connector to the Brake Pedal Position (BPP) sensor, remove the booster pushrod retainer bolt and retaining clip, disconnect the pushrod from the brake pedal, and remove the cross brace and master cylinder if applicable. Disconnect the brake booster check valve and vacuum hose from the booster, then remove the brake booster mounting nuts from under the instrument pane, and to install the booster, position it on the firewall until the studs are visible.