Compression Ignition Addict
Join Date: Sep 2010
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are we talking the brake warning light on the dash? if so something is changing when you add revs, could be low fluid but i don't think 96 had a low level warning, possibly loose wire to brake valve vibrating and grounding. most likely though is that it is losing vacuum somewhere and it can't quite keep up at idle. put a vacuum gauge on the brake booster and monitor it at idle and revved up.
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2005 F350 srw Crewcab lariat. 6.0 diesel