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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I have the ABS system in my truck, when you apply the brakes hard and the ABS senses a lockup, it will modulate, hence antilock lock. You will notice almost a rattling noise with pulsing in the brake pedal, that is normal.