Spongy Brake pedal resolved
I have a 1999 F-150 ext cab 4x4, I have had a low spongy brake pedal for years. After replacing every brake component, master cyl twice, power brake booster, abs module, soft brake lines, calipers all around, rotars, pads, brake pedal, bleeding until I was blue in the face and many trips to the dealer and other brake shops regarding abs scan tool bleeding which is a crock of @#$% on this truck over the last couple of years, reading all kinds of posts of people going through the samething and also the post that says adjust the push rod between the master cyl and power brake booster ( DO NOT ADJUST THIS ROD IT IS NOT THE PROBLEM ) The rod from the brake pedal to the power brake booster is ''ADJUSTABLE" and is the problem for a spongy low brake pedal. While I was replacing the pedal brake light switch I noticed that the rod turns either way, to the left lengthens it and to right shortens it. The rod has very fine threads and take many turns for a minor adjustment, 30 turns to lengthen it for me which was about 1/2 an inch. Now I have 1/4 inch play with a good firm pedal and brakes that will stop on a dime inside your pocket. I am not saying that this is a cure for everones spongy low brake pedal but worked for me.