1994 GMC K2500 Visibilitywindshield Wiperwasher Problems

THE WINDSHIELD WIPER SOMETIMES WON'T WORK WHEN ACTIVATED, THEN A FEW MINUTES LATER IT WILL SUDDENLY COME ON. THIS HAS HAPPENED SEVERAL TIMES WHILE DRIVING IN THE RAIN AND IT IS HARD TO SEE. THE DEALER STATED THAT MY TRUCK WAS NOT COVERED BY THE RECALL OF THE WIPER CONTROL BOARD. THE BRAKING PROBLEM I AM HAVING IS THAT I HAVE HAD TO REPLACE THE FRONT PADS 5 TIMES AND THE ROTORS 3 TIMES IN 36,000 MILES. THE REAR BRAKES DO NOT SEEM TO BE WORKING AT ALL. FOR SOME REASON THE FRONT BRAKES ARE DOING ALL THE BRAKING WORK AND WORP/CRACK THE ROTORS. THE LAST TIME THE FRONT BRAKES AND ROTORS ONLY LASTED 3000 MILES. THIS TIME I HAD THE DEALER REPLACE THE REAR BRAKES ALSO TO SEE IF THIS HELPS. IT SEAMS LIKE SOMETHING IS KEEPING THE REAR BRAKES FROM FUNCTIONING CORRECTLY. THE DEALER HAS NOT BEEN ABLE...