How ever you opt to drain and change your brake fluid, when bleeding the brakes keep the resevoir full at all times. The rear section of these resevoirs are easy to run dry. It is especially difficult to tell the level of all new brake fluid, it is nearly invisible. I suggest topping off (ensuring both sections are full) every third crack of the bleeder screw.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.