One problem related to brake master cylinder has been reported for the 1996 Ford E-350. The most recently reported issues are listed below.
Anti lock brake system experienced continued problems, possible design flaw of location in mounting of the unit, mounting is on the frame near exhaust heat factor, possible restriction to the system, not allowing the fluid to return from the calipers to the master cylinder (resulting in overheating and failure of multiple brake system component replacements). Mjs.