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1983 911 SC Brakes - Hydraulic lines

Brakes

Vehicle Information: Model: 911 SC; Year: 1983; Body Type: Convertible; Total Mileage: 104,000;

I'm attempting to completely change the brake fluid, and to do so, I adapted a pressure valve to a cap & used a hand pump to pressurize the system. Well the system won't hold the pressure and fluid is leaking from a seam on the bottom of the car just inboard from where the battery is located in the trunk. The leak could be anywhere, and just draining at this point. I have checked the lines in all the locations where they are visible, including the areas in the smuggler's box. I am in the beginning stages of removing the master cylinder & booster, but I decided to first see if you had an easier way to diagnois the problem. As usual, I appreciate any assistance you can provide me.

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