Have a 2004 grand caravan . The vehicle has good brakes one minute then peddal goes soft the next time applied. Then some times right to floor with absolutly no brakes at all. This problem has been on and off for the last year

SOURCE: brake pedal goes to floor after bleeding the brakes many times

start off by pumping the peddle 25 times with engine off ... bleed the abs system (usually has bleeder valves near/on control unit). then bleed the rest as usual with engine off ... DO NOT turn the key on while bleeding abs brakes.

SOURCE: remove the rear brake drum on 2004 Dodge Caraven

No just make sure your emergency cable is off and take a large hammer an hit it around the edge or corner lightly and spin at the same time also try pulling with your other hand as you spin this is a technique all mechanics use its very unlikely that you will have to loosen up the shoes with a brake spoon.REMEMBER THE OUTER ROUNDED EDGE ONLY WHERE ITS THE THICKIST.

SOURCE: Intermittant instrument cluster

HIT THE DASH! The instrument clusters (gauges) have bad soldering joints. You can hit the dash above the cluster to jar it to connect. A hard hit. Many have this problem, and you are better off taking your instrument cluster out and soldering the connector pins on the back then purchasing a new one or taking from the junkyard. They are all the same, and fail with time if left unsoldered.

SOURCE: Headlights won't come on intermittently 2005 Dodge Caravan

Quite possibly the switch, Dodge minivans also have a front control module located under the hood, it attaches directly to the underhood fusebox, if a switch doesn't fix it I would look there.

SOURCE: ABS and Brake light stay on plus pedal is soft after tight turn

sounds like you have low brake fluid pressure and the pressure sensor is turning on warning lights saying there is low pressure and also pedal going to floor indicate this, sounds like master brake cylinder is worn out/broke and needs replace ment