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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
crack all your bleeder screws front and back...then let gravity bleed all four lines. Make sure you keep topping up the master cylinder always keep it full....you have to have a lot of air in your system.
if you re-used the old copper rings from your old lines, your letting air back in.
Not true. I can't tell you how many calipers I have installed over the years and re-used the brass/copper o-rings. As a matter of fact, the reason I don't is b/c when I first started doing this way back when, the new o-rings failed so I never changed them since and NEVER has there been a problem.