I am really embarrassed to ask such a basic question after owning my Mopar for over 50 years, but here it is: my 69 roadrunner has had a brake failure due to a bad master cylinder; now it has been rebuilt, but I need to bleed the whole system. The car has power brakes, and the question is: does the engine have to be on while bleeding each wheel or can I do it with the engine off? Thank you.
Before you go any further with the bleeding of the system, seeing that the master has been rebuilt/replaced, best to check the air gap between the booster's rod and the bore of the new master, even if it's the original unit rebuilt, dimensions can change, too large an air gap, the pedal will always be on the floor, too tight or no gap will result in the front calipers dragging....Mopars generally are good with .060 air gap.....and can we assume you have/plan to bench bleed the master before install?
Here's some pics to understand the "air gap"...
