If you were manually bleeding I don't think the cap would have anthing to do with it. As long as the reservoir is full when you are pumping and you do not let any air into the system. The reservoir is not pressurized it is just a holding tank.

With that said, as stated above, try bleeding again.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record