I don't think so, please check RepariPal's recall information to be sure. Here is the link - http://repairpal.com/ford-explorer_sport_trac-2007/recalls
It should take an experienced technician about 1/2 hour to replace the thermostat on your 2005 Lincoln Aviator. That labor time would suggest replacement is not to difficult.
Having your brake warning light illuminate on acceleration or when turning could very will indicate low brake fluid. If the fluid is low, the brakes should be inspected to find out why.
I cannot find any info for code P0402, are you sure you do not have a code P0420? Code P0420 would indicate a failed catalytic convertor.
I would guess that both banks are running lean on your 2003 Cadillac DeVille - they are probably right at the threshold required to set the trouble code, which ever side happens to pass the threshold at any given time will set the code. Is not uncommon for the rubber on the intake plenum duct to crack causing the symptoms your are describing.
The brake booster vacuum hose runs from the intake manifold to the brake booster.
Will the fuse blow even when not stepping on the brake pedal? If so that would indicate a short to ground in the wiring between the fuse and the brake light switch. The wiring will require inspection to find the exact location of the problem. If you must step on the brake to make the fuse blow then the fault is in the wiring after the switch.
It sounds like one of the front wheel speed sensors is failing on you 2004 Chevrolet Trailblazer. Reading the fault codes stored in the ABS control module should be the first step in determining exactly what the problem is.
On you 2010 GMC Acadia, it is recommended the sparks plugs are be replaced at the first engine oil change after 100,000 miles
The ABS warning light should illuminate during the bulb check function - there will also be an electrical in the area of the front wheel hub connected to the wheel speed sensor. No sensor, no ABS.