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I recently picked up a 95 F250 4x4 w/351 after my 89 got crushed by a tree.
Anyway, I was driving it and the brakes had a weird behavior. When I stepped on the brakes, the pedal went down and stayed down by itself even when I let off. If I tapped them or gave the pedal a slight pull back they would release without a problem. It almost seems like an issue with the booster.
Has anyone experienced a similar issue or heard of anything like this?
Yes sounds like the booster. With the engine running but vehicle parked press the brake and if it stays down pull the vacuum line off the booster, if the pedal returns you found your problem.