Hi,
there is no need to open the bleeder nipples by winding the pistons.
I guess I wrote about it a few month ago but may be it,s not important what a Kraut says.
It is possible that the brake master cylinder was damaged during bleeding by pumping the brake pedal. So first you need to find out whether the master cylinder is blown or not. Therefore remove the brake lines from the master cylinder and switch them with bleeder nipples. Bleed the master cylinder alone by these nipples. This is a little effort and takes just a few minutes work. After bleeding the master cylinder you will have full pressure or no pressure on the brake pedal. (Edit: In case of a faulty master cylinder, the pressure might also decrease while keeping the foot on the pedal.) No (or decreasing) pressure means, that the master cylinder is blown. Please let us know about the result of this little test.
I drive a Citroen Xantia and a C5 Tourer. Nice cars but even not free of trouble.
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