We have a 2007 H2, and every time the brakes are applied, the ABS kicks in right before the car comes
to a full stop, even when braking slowly. Is this a module issue, or possible other cause? I see that the replacement ABS modules are pretty expensive.

 

It's most likely a wheel speed sensor, sometimes they get rust under them and a good wire brushing will fix it. Your first step is to take it to someone who can scan it and tell you which wheel speed sensor is acting up.