regarding the age of your veh.depends on whether you have a dual mass flywheel so only you can answer that one,which are bad for rumbling/knocking,if there was no noise before you done the clutch then there may be problems with the one you fitted,if you open the bleeder have found these to bleed themselves with gravity but if that doesn`t work then someone pumping the pedal whilst opening/shutting bleeder might work also,if you are still struggling then a pressure bleeder may be your only option
cdc, April 2012