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Message: <blockquote data-quote="maillemaker" data-source="post: 1517602" data-attributes="member: 30051">I don't know if the Mustangs are similar, but my 1990 E350 van(RV) has a RABS module.  Evidently if you get air in them you have to cause the module to cycle while pressing the brake to force the air out of the RABS module.  A fellow made a pigtail and alternated +12V to two terminals while stepping on the brake and it allows the air/fluid to return to the reservoir when the peddle is pressed.I was reading about this because my E350 pedal has been spongy since I let a shop to repair work on the brakes.  I suspect they got air into the RABS system.</blockquote>