One problem related to brake disc caliper has been reported for the 1998 Ford E-350. The most recently reported issues are listed below.
Always pulls to the left when braking. Left front locks up and skids whin braking for a sotp on wet pavement or on unpaved surfaces. Same occurs when loose material is on paved surface. Brake components (shoes, calipers, etc ) have been replaced by the dealer at considerable expense with no improvement. There was a blue ring on the left front rotor when work was done. When the left front skids there is no braking. Fortunately it only happens under certain conditions (at low speeds) resulting in only 20-30 occurrences in 94,00 miles. The pull is compensated for on dry conditions by increased steering effort and by the steering stabilizer. The dealer (gilmore Ford) has been able to verify the condition but unable to correct. I have been unable to contact a foctory tech. Representative. I understand that there are others with this same problem but not many drive as much as I and may consider the individual occurrence unique. It is also possible that low speed accidents have occurred and just been considered "over driving". I had to recently cancel use of this vehicle on a trip because mech of the travel was in the mountains on unpaved roads and would have been unsafe!.