Brake Antilock Wheel Speed Sensor problems of the 1996 Ford E-250

There is a pressure switch on my master cylinder of the braking system. There is o listed recall for my pickup truck how ever after about $900. 00 and 2 different auto shops I found this switch to be the defective part and when I went to the dealer jim click of tuscon az and the parts guy gave me the part I requested I questioned the wiring harness adaptor and why the switch was not the same as I brought him. He stated well there was a lot of failures with the old design and it was a recall I stated well shouldn't the part be free no response - - the defect in the part was an air leak causing me to chase it for a year on and off constantly bleeding little air bubbles out with over a gallon of fluid. I noticed it with just the ever so slight of dirt sticking to the leak on the under side of switch which could not be seen. This leak resulted in a constantly soft pedal with a about a 1-2 second braking delay. I checked to Ford site and the only existing recall is a speed sensor. Not for this part.