You could have warped rotors or a brake caliper sticking. Have you rotated and balanced the tires lately?
What about the shock absorbers? Including the struts?
Stiff shocks will often create flat spots on tires over a period of time. Were these replaced?
SOURCE: front end vibrates when brakes are applied
Sounds like the rotors are warped,Were they checked during brake replacement?
SOURCE: pulsation in brake pedal and rear end hops during braking
What happens is if you have a bad front wheel bearing when you brake that wheel will turn in or out,when this happens it throws the four wheel alignment out and since this is a solid rear axle,it's forcing it to flex on the suspension,wich could cause the rear tires to bite on the outside edge of one tire and the inside edge of the other,thats one possible the other would be that the rear brakes are are not slowing the wheels evenly causing the same issue.I saw this problem with a bad front wheel bearing on a Nissan Pathfinder but not as pronouced due to the independent rear suspension. Check the front wheel bearings,which of course will mean getting the calipers off the rotors,and then check for any movement in the rotor,if there is check the hub nut,if it's loose tighten it and check for play in the rotor if there is still play that's going to be caused by a bad bearing.You can check the braking in the rear with a simple spring scale(like the ones used for fishing),with the wheels removed have someone apply enough pedal pressure to just engage the brakes but still allow movement attach the scale hook to a wheel stud and pull until it starts to move and note how many pounds of pressure it takes to move the hub.If it's uneven chech your adjusters and even them if needed and then retest,if still uneven you'll need to bleed them again.As far as the dark black substance in the fluid I would say you may gotten a contaminent in the fluid.Brake fluid gets kind of a rusty reddish residue when it breaks down.If I missed anything or you need clarification don't hesitate to ask I'm home all day.Hope this helps solve your problem.
SOURCE: When appling brakes on a 2000 Jeep Grand Cherokee, steeing wheel
New revised calipers. and have the new rotors machined right out of the box before installing
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I also wanted to add this are the originals wheels and tire size as factory. Had the tires rotated and balanced two months ago. Took back this morning to have them check tires, air pressure, suspension, brakes. Everything looks fine and the tire are perfect. When we replaced the suspension we did lower and upper control arms and the bushings. At this point been having this problem on and off for a couple years now and the problem keeps coming back?
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