Most of the cars I have owned have had that problem. I just keep adding fluid because there are so many other problems I put ahead of rebuilding the brake booster. Just adding fluid is lazy/annoying ,but I would not call it "unsafe". As long as it's a slow enough leak that air isn't sneaking into the system on you ,it would be my opinion that you can put off the repair for a bit.
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1988 Supra - N/A 5 speed
1974 'Cuda - 318
2001 Cherokee
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