I am having and issue in my 2005 Jeep Liberty CRD when i put it in reverse with my brakes on i get a bad vibration for the first few moments. It only happens if i press the brakes and then reverse. If i put it into drive or neutral the vibration stops. And when i am going in reverse it feels like it is dragging a little bit. I have bleed the brakes and i am going to lube the caliper tonight. Any other ideas on what it could be?

Update:

I lubed the caliper and have had a few more thoughts that might help out. I have recently had to cut and boot my CVs. I have also put on a set of JBA Gen 3 upper control arms with new bushings and kept the Moog ball joints. I have greased everything and bleed the brakes again still getting the vibration in reverse. It is more sporadic now thought.

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Motor mount.

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2006 CRD http://www.UtahPowderCoatings.com/ http://www.gorecon.com/ I'm kind of a big deal.
RL rear bumper, ARB front bumper, Mile Marker winch, Power Tank, Skids by Mopar & Skid Row, RL Super Skink Sliders, 235/85R16 MTR, Air Flow Snorkel, DTT, 4.10 gears, Frankenlift II, Katskin leather, JL Audio stereo, Rosen video.

The motor mount wouldnt be sporadic would it and plus i just replaced the passenger side and tighted everything down the spec.

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hahahaha Mine does the same thing, Kinda reminds me to add the additive to my Trac-Loc rear end. It did it really bad for a short time turns out we had a bad rear caliper (It would stick sometimes) which caused the TL to lock up when we where reversing and caused a light shudder.

Well i can see how that could be a possibilty I do have small hole in the piston boot on the drivers side caliper. But didnt see any point in replacing it because it hadn't caused any problems yet.

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Exact same as mine even the same side, It only did it sporadically. Sometimes worse than others.