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Originally Posted by stevec108
Problem solved!!!!! As it turns out, the "brand new" master cylinders (I tried TWO of them) that I purchased from NAPA, were either faulty or incorrect units. Out of desperation and one last attempt, I re-installed the original, sporadically faulty master cylinder and immediately had pedal and have successfully bled the entire system. I have now called Jeep and ordered a factory master cylinder, about three times the cost of the NAPA unit and will install that when it comes in. It goes to show me once again that once gets what one pays for! Caveat emptor!!!
Thanks for all the advice that propelled me forward to try different things.
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Since I'm the guy that originated this particular threaded discussion, I may not be the best person to express my opinion here. However, in my opinion, "good pedal" is that in which one feels solid resistance at least 1/2 way through the full travel/sweep of the brake. If there is any sponge-like quality to the pedal, then it is likely caused by a faulty master cylinder and/or slave/wheel cylinders OR air in the brake system. I returned my incorrect/faulty master cylinders today to NAPA and with appreciated apologies, the parts guy suggested that the next time I bring in the original master cylinder from which they could take the servial numbers for a better match. Again, my original master cylinder was visually identical to the new one I bought, but the thing did not work. The parts guy also thought that the activation rod may have been too short or too long for the system. I have no idea about retrofitting from ABS to conventional so you're on your own with this. However, brakes are brakes and they all basically work the same in my opinion. I'd be suspicious of the master cylinder connecting rod, of its length, in particular.
Good luck!