Before replacing the Brake Master Cylinder (Vacuum Boost), ensure the parking brake is on and the electrical wire at the Brake Fluid Level Sensor is disconnected. After this, disconnect the brake hoses and put caps on them to make sure there is no brake fluid leak or contamination. Unscrew the master cylinder mounting nuts, take out the master cylinder, and afterwards the master cylinder reservoir. First, put the master cylinder reservoir in place, and then bench bleed the master cylinder. Set the master cylinder in place, use the fastener notice as a reference to install the nuts, and tighten them to 36 n.m (27 lb ft). Remove the caps from the pipes, put the brake lines in place, and tighten them to 25 n.m (18 lb ft). Install the electrical connection on the Brake Fluid Level Sensor, bleed the brakes, and afterwards set the parking brake.