Re: 2002 Jeep Liberty 3.7
Does a 2002 Liberty has brake assist? It has ABS and the electrical rear brake function.
The ABS can bleed away the brake pressure for each wheel, to prevent wheel slip, but it will not add any pressure. It sounds strange that the brake pedal becomes hard when the ABS fails, but that is your experience.
But it is strange indeed that all happened at the same time.