Following the - now red - brake line further up to the glider we will soon reach the first of the three cascades which need to be opened to replace a brake line of the upper cascade.

The procedure to open that connection is basically the same as for the previous uncascaded loop through connection.

Carefully pull the open end (red line) all the way through the loops of the cascading lines.

Pull the cascading lines through the loop of the line that is to be removed