That definitely helps. Cable actuated disc brakes are easy to work on and adjust.
So what happens when you pull the brake levers? Do you see the calipers move? Is it just that they don't move enough to make the brakes actuate powerfully enough?
I'm not familiar with the ProMax brakes, but there may be an adjustment knob on the caliper. If not, you'll have to use the barrel adjuster on the lever. If there's not enough adjustment there, you'll have to pull some cable where it's screwed down on the caliper. You may also want to check that your pads aren't too worn out.
If you want to bring it down to Santa Clara during the day, I can take a close look at it and give you some tips. You can PM me if you want to bring it down.