Auto-Bleed? I Keep Killing Master Cylinders
I have always simply done the RR, LR, RF, and LF brake bleed, only opening the bleeder with pressure on the pedal and have never had a problem but according to Auto Zone'* tech pages for the Bonneville, that is not the correct procedure for all Bonnes with ABS.
One brake system, the Delco Vi and Bosch V, calls for a pressure bleed while the ABS valves are being actuated via a scan tool.
From the Auto Zone Home Page, select 95 Bonneville, then vehicle repair guides, then brakes...lots of stuff on several different brake systems for the cars covered.