Saturn has a whump whump and brakes are weird

Had to borrow my friend's 2000 Saturn SL, 92k miles while my car is in the shop. The Saturn has several symptoms. While driving, it exhibits a mild whump whump sound and feel from the front end. While braking at low speeds the brakes kind of grab, release, grab release but no feedback through the pedal or steering wheel. When almost to a stop, the rear brakes squeek.
The front brakes are near new, the rears are thin but still within spec.
When off the ground and tires off, the whole brake assembly seems to "wiggle" and there's quite a bit of CV shaft wobble from side to side yet the axle seems to spin true. Warped rotors, bad CV axles?
Please help.