Re: 2007 Merc Mountaineer Problem --ABS
I'll guess that the problem lies with the ABS system itself. The brake light comes on, along with the ABS light only when a fault occurs within the ABS system. If the brake system had no fluid, or encountered another problem that is non-ABS related, the ABS light would not illuminate.
Depending on the weather and road conditions, a sticky piston within the brake caliper can cause grief, and illuminate both brake indicator lights on the dash. Another issue, although rare, could involve the brake booster filling up with enough fluid that can cause a variation of pressure. A member on a Dodge forum drained 1/3 pint of fluid out of the booster and installed a drain valve from an old air compressor as it's a PITA to remove to reach the bottom of the booster.
To start cheap, a brake fluid flush can do wonders, especially in areas with colder than usual climate. Dirt and crap eventually finds its way down the brake lines to the caliper. Cold temps greatly reduce fluid flow as the brake fluid is not circulated like other fluids are in the vehicle. Power steering fluid should also be checked regularly, and changed every 60-70K miles. My older GMC 2500 would rotate the front ABS side to side during the summer. I thought it was morning moisture on the rotors but then it got worse and happened while driving out of town. I had a brake fluid flush and it solved the problem. Just some food for thought.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!