Mechanics

F250 ABS LIGHT AND SPEEDOMETER PROBLEM

1992 Ford F-250

Brakes problem
1992 Ford F250 V8 Four Wheel Drive Manual 175, 00 miles

When you turn on ignition rear ABS light comes on as it should. After starting engine, ABS goes out but comes back on 30 seconds later and stays on. I checked sensor on rear end and plug-ins and they seem ok. Also, the speedometer fluctuated when the speed was constant, which affected the cruise control. I have bled the brakes, shoes and pads about 60%, checked vacuum booster, and checked the vacuum pump (this is a 7.3 diesel). Also, the brakes are frine and feel as if the ABS is working.
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Glen T
September 21, 2008.




If the speedo fluctuates it will set an ABS code, that is what the ABS comp uses to determine vehicle speed, so does the PCM for the engine and trans. Need to have the ABS system scanned for codes to see what it is seeing wrong

Tiny
Jack42
Sep 25, 2008.


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