Where do the rear brake lines connect to the master brake cylinder?

The rear brake lines connect to the master brake cylinder at designated ports, typically located on the side or rear of the cylinder. In a typical brake system, there's often a specific port for the rear brakes, which allows hydraulic fluid to flow from the master cylinder to the rear brake components. The exact configuration can vary depending on the vehicle's make and model. Always refer to the vehicle's service manual for precise details and diagrams.