Two problems related to brakes failed have been reported for the 1997 Ford F-250. The most recently reported issues are listed below.
Rear brake failure on numerous occasions. Finally resulted in crash. Dealer could not find any problem. Self diagnosis of raising rear of vehicle while idling in drive with rear wheels spinning rear wheels could not be stopped with full brake pressed. No braking on rear wheels. Disconnecting wire to proportioning valve results in normal rear brake operation. Possible cause is ebcm or proportioning valve.
Consumer was entering a freeway at 45-50 mph when he tried to stop vehicle and could not due to brake failure.