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Yes, the piston in the distribution block has not reset. Plus, you may have air in one circuit but not the other. BTDT got four front pads worn to a wedge shape and metal to metal real quick.
The solution depends on how much air got in. Into the lines down from the MC or beyond the Distribution block.
Try this: Perform a partial pad replacement on all four wheels, start with the RR wheel. That means do everything except actually replacing the pads. One step is to move the pads tight to the calipers which pushes the pistons all the way in. Do both pads. This will push quite a bit of fluid (and air?) back up into the MC. Do the LR wheel next, then the RF and the LF wheel last.
After all that, with the car still off the ground, gently pump the brake pedal and build up pressure. See how it feels. Start the car and try it again, gently.
If the Brake Failure light is still on here's another idea: The idea is to weaken one circuit at a time, attempting to move the failure alert piston to move one direction and then the other. Open a rear wheel bleeder and step on the brakes hard and briefly. Add fluid and do the same on the opposite wheel.
If that doesn't re-set it, you may have to do another bleeding to clear it.
Good Luck,
Bob
:>)
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