Okay, what do you mean by "brakes didn't stop like they should?" Are they not pulsing? How, exactly, are they behaving? Is the brake pedal not funtioning like it should (i.e. depressing too far?) Is the vehicle skidding? What is the average temperature where you live right now? Are you sure you used the right brake fluid?
Even if I can't help, this information might help others diagnose your problem.
One more thing, since the front wheels provide most of the stopping power due to weight distribution, is it possible that the back wheels are locking because they are overcompensating for the lack of front-wheel traction? How worn are the front tires?
Pardon the slew of questions, but the more information, the better.
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