E34 M20 525i ABS Pump [Archive] - Bimmerfest - BMW Forums

: E34 M20 525i ABS Pump

09-08-2008, 03:10 AM
Every now and then while driving for no apparent reason the ABS light comes on. On these occasions after driving the ABS pump runs for an hour or two after the vehicle is turned off. After that every thing is fine for a week or two until it does it again. What should I start looking at?

bimmer dot info
09-08-2008, 08:48 AM
Find a mechanic that can read ABS system codes or have the dealer read them (and nothing else, they will charge you for an hour of labor for this 5 min procedure).

09-08-2008, 10:50 PM
The ABS pump refused to turn off yesterday. I took it to a local mechanic who seemed quite clued up about BMW's. His scanner refused to talk to my car. He deduced that it wouldn't be the wheel sensors as the pump was running all the time. He suspected the computerey bits or the ABS relay. I eventually found two relay's under the cover adjacent to the ABS pump. Luckily a local wrecker had my model so i swapped out the two relay's and the problem has so far disappeared. Fingers crossed.

10-06-2008, 06:32 PM
Must have been the relays