Was changing the transmission fluid and being under need the car I spotted some rust on the brake line, barely touched it to inspect it and left it alone. Finished up the work when I spotted a large amount of brake fluid dripping on the floor. I already felt the brake pedal going to the floor when I was going through the gears. The weird thing is that the level in the reservoir didn't go down.

Now the question is, do I have to replace the entire line at both sides of the fitting or will just a new fitting do and how involved is this job?

1990 300SE W126




If the lines itself are fine is this the coupling I need?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).