Have you ever applied the brakes(usually first thing in the morning) and noticed the pedal pulsating or vibrating, then the car seems to slide around like its on ice?
The problem is probably moisture in the front ABS connectors. Yeah-yeah-yeah...I know, it sounds far fetched....but its true. Ford found out that micro corrosion was forming in a crucial part of the ABS system.....the front sensors. When this happens, it gives the ABS an erroneous or erratic reading and the module thinks the front wheel(s) is/are locking up. I have had the "breakout box" on several cars and took resistance reading and shore enough.....thats the deal. As soon as you disconnect and connect them back, the reading are where there suppose to be.....just not for long. It always comes back.
The fix is to go through this long T.S.B. to solder and heat shrink new style connectors on the front.
WANT TO KNOW HOW TO FIX IT WITH LITTLE OR NO MONEY? Disconnect front sensor connectors and use electrical contact cleaner(brake cleaner will work in a pinch), blow it out with shop air and squeeze a good amount of "DIELECTRIC GREASE" into the FEMALE side of the connector. When you squeeze the connectors together, it will ooze out...but thats o.k. You can bet its full and no moisture will ever get in again! i'VE USED THIS TRICK ON ABOUT 40 OR 50 Mark VIII's and NEVER had one come back.
1969 Mustang Conv.