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Stop

i have a 1999-jeep cherokee 4.0 liter 6-cyl.when i press brake to stop.truck lunge forward violently,any ideas.

So little information, only answer is obvious. Take the car to mechanic and have your brakes checked.

Not a lot to go on, but how about an engine mount? Or do you mean the Jeep does not slow down, but rather goes faster?