04 international dt466 electric back up brake not working

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{"text":"I have an 04 international dt466/4300 when key is off or just in on position without truck running the backup electric brake booster not coming on. When truck is running brakes are fine. \nI’m concerned if the truck is on the road an stalls out there will be no brakes.\nWhere do I start?","pics":"[]","canComment":true}