I bought a "Power Bleeder" to flush my brake system, it tells you to put some presure on the system before bleeding to spot leaks. Sure I have some leaks; fluid is coming out of the two black knops on top of the reservoir (see picture), is this normal or do I have to replace the reservoir?

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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).