Q: brakes quit working periodically on 1990 Ford F-150

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I have a 78 f150 and all of a sudden last night the breaks quit working when i got to the store.nothing at all they just went to the floor. thank goodness i was going slow.... anyway i checked everything and fluids a good no leaks. so i left store easy and brakes worked fine... then when i got home i went to stop and they quit working again.. i have no idea where to start on this,

(1) Answer
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