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1984 911 Carrera Soft Brake Pedal

Brakes

Vehicle Information: Model: carrera; Year: 1984; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 105000;

I drive my car twice weekly (100 miles total). During the first brakeapplication, the pedal sinks about half way down the travel. After I pumpthe pedal just once the feel is normal/hard. As I live in the desert I doa lot of highway driving and after 10 minutes the next brake applicationis soft and travel is long. When driving in the city (frequent brakeapplications) the brakes are normal, but when intervals of about 10minutes are introduced the pedal feel returns to soft and long travel. Ido not notice any fluid leakage. Is this a master cylinder problem, airin system, or a possible sign of booster problems?

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