If Bleeding does not help it may be the Master Cylinder needs replacing. You might have washed out all of the gunk on the bottom that was helping to keep it sealed.

I did not agree with it but I believe about 3 weeks to 1 month ago there was a thread that also said or ask if a Master Cylinder could be damaged by the Manual Bleeding.

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84 300D, 82 Volvo 244Gl Diesel