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oil in brake boost hose??????

657 Views 2 Replies 3 Participants Last post by  pgemma
I have a 2001 chevy silverado 4x4 with the 5.3, i had to change out the knock sensors, and when i did i pulled off the brake boost hose and oil was dripping out of it, has any one else had this problem, is this normal, if not how do i fix it??, any info would greatly be appreciated.
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