1983 911SC Rear Brake Pipe Union

[reprs]

I have a leak which I think must be at the rear coupler/union to the rear brake pipes but can't find it! I have only jacked the car up so far but could anyone tell me how I get access to it?

Thanks

[targa80]

Here are three pictures showing the rear exit from the tunnel on my 80SC. The brake line union is visible in the first picture. The second picture shows the routing of the driver side rear brake line and the third is an overall view of the connections in the rear tunnel area.