There is a multitude of things that'll cause jerking in the front end when braking, one of which, but not specifically, are: worn suspension parts, bad brake hose, bad abs unit, stuck caliper, stuck caliper pin, wedged pad.
Pulsating brake pedal is caused by 3 main symptoms listed in likely hood:
bad wheel bearing
trapped rust or foreign material between rotor and hub
Squeaking rear end parts can be caused by: bad shocks, loose bushing bolts, worn out spring base pads and/or broken spring/s.