On my 2015 Ram truck I did all 4 corners pads today and at the same time was gravity bleeding the brakes. It worked so well that I missed the right front caliper emptying out my master cylinder reservoir.
I refilled the MC, bled some more out of the front right with gravity then with pedal with a helper until there were no bubbles. Also pedal bled the front left, never saw any bubbles.
Brakes work very well, but with the engine running and with a lot of force, the pedal sinks to the floor, slowly, over about 10-15 seconds.
Cracked the lines at the master cyclinder and pedal bled that directly, but no improvement.
From all I know about brake systems, the MC is the culprit. There is no spongy feeling, truck brakes hard, so doesn't feel like air in the lines. Could it still have air in the MC it leading to this sinking pedal or are the MC seals shot (from being put through the wringer)?
What do I do next???
Thanks!
George