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I have a 2012, two door, Rubicon with soft brake pedal. The pedal goes to the floor once engine is started.
Has been to 3 different shops including the dealership with no resolution.
The following has been replaced: 4 calipers (powerstop), 4 rotors (powerstop), all pads, 4 braided lines, master cylinder, brake booster, ABS module, vacuum pump and has been bench/pressure bled. There are no apparent leeks in the lines.
Any ideas?
 

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Does your vehicle stop properly? We run into a lot of people who have a vehicle that stops properly but they can overcome the pedal and push it to the floor. If this is the case, it's normal. find another Jeep to compare.
If your pedal goes to the floor when you stop then I suspect you have air in the system. You can normally bleed JK's all you want but you won't get a good pedal. You have to bleed them then go through a abs bleed procedure with a scan tool, you must follow the instructions on the scan tool. then you will probably have to repeat the bleed procedure again. That will fix you up.
A lot of tech's don't know this or they don't follow the instructions properly.
 

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The pedal will go to the floor when started as the vacuum boost builds. So if brakings is ok, it may be normal, but if it was a change in condition then suspect what ever was done just prior.

Were all those parts replaced to fix the bad pedal feel or you just saying they've been replaced?

What were the conditions when the pedal first went to the floor?

What did you change in order? Order is important...

Bad bleeding job, bad master bleed, bad master, bad booster would be guesses from most probable, add in mistakes in installation of any of the components since they've been replaced. Braided lines I would inspect carefulluy. Bad part numbers (discs or pads)
 
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