Problem solved: there was a bad sensor in the new/after-market brake booster. What luck! Two sensors stick out of the brake booster and communicate with the AdvanceTrac system, one of which was not functioning correctly.
I don't know... is that the kind I can get read at AutoZone? I don't have a reader myself. Also, my mechanic said there were no error codes when he looked at it. Of course, he hadn't driven it at that point, and it has to be driven to come on. Wouldn't the "Check AdvanceTrac" error codes show...
2005 Ford Expedition Eddie Bauer with Electronic Stability Control / AdvanceTrac.
I had a vacuum leak on the brake booster so I had the brake booster replaced (yes, I could have done it myself, but I didn't have time and I have a trusted mechanic who, in the past, has been good). He said he put...
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