#1 suspect is the rotors.
Cheap rotors do not dissipate the extreme heat very well.
Do a front brake job, and upgrade to a better grade of rotor, and consider a better designed rotor - more $$'s but have engineered to be great at dealing the the high-heat conditions.
See "Related Questions" below for more
No. Your normal brakes will still work even if the ABS Module is bad. You will however have no ABS function.
the brakes were not fixed properly some part is installed wrong
Pragmatism
I did not think the Windstar came with *front* drum brakes (assuming the question is referring to brakes)...There are instructions for changing front disc brakes and rear drum brakes in the "Related Questions" below
The most common cause is from the brakes overheating from being overworked.
Make sure there are no fluid leaks getting on the brake linings' Make sure all brakes are working and are adjusted properly Make sure brakes are wearing equally
It is possible for the brakes to lock up on a 2000 Chevy Venture when in reverse because the brakes are not working properly. Perhaps the brake pads need to be changed.
Did you bench bleed the master ? Are the calipers and wheel cylinders working properly ? Is there a break in the line somewhere ? Last , is the booster working properly ? What happens when you step on the brake now ? Are they soft and spongy ? Does the car stop at all ? More info is needed to answer this question properly.
rear brakes need adjustment srar wheel froozen
I would say a vacumn leak. Check hoses, measure vacumn with running at idle and at idle when brakes applied. This assumes you have power brakes and it idles well without the brakes applied. Please make sure that the clutch is working properly... Does your clutch work properly?
Gently pump the brake pedal.
Check the brakes. You may need new rotors. You didnt say how hard you stand on the brakes because if you are heavy on them it could be the abs unit working properly