I have a 1992 f250 xlt lariat extended cab 4x4 with the 7.3 @95000 miles.
I was driving today when I had to hit the brakes hard. Had a little tire lock up then pedal went to the floor. pump with no pressure. limpt'd around corner and then had full pedal pressure back? worked fine again. I was close to home so when I pulled in the pedal went back down to the floor. Both the brake and rear abs lights are on and I have pressure back? Have to park it till I narrow it down. Fluid checks out fine. any suggestions would be greatly appreciated.

 

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