Did you bleed the ABS module?

What Jeep does he have then? The only Jeeps I know of that are diesel are the new Grand Cherokees.

Diesel swap is never legal in an original gas engine vehicle. But Guy is right, mine is bone stock, and as American as German Apple Pie.

Mercedes 3.0 turbo diesels came in the 07/08 GCs, just not in CA.

Nooo... que?

Any time the MC is replaced there is a good chance that air has made it to the ABS module. Since it does not get bled with the rest of the system since fluid only goes through it when an ABS action is enacted, which might be why when you jammed on it, the brakes were ok until the new air bubble reached it. Typically you need a Tech 2 style scanner to get the ABS port to open, but sometimes you can go out and drive it, hammer down on it a few times and continue to bleed the brakes. Or, crack the fittings on the ABS module it self to try and bleed off the air, but again, since it only sees pressure during an ABS event, it won't always work.

Damn, ok Thanks Guy. Hopefully thats it.

No bleeders on the abs module.

I know, that's why you can sometimes cheat and crack the fittings on the brake lines