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if you are getting fluid to the bleeder on the air pack and nothing at the wheel cylinder bleeders that should tell you the air pack is the problem.easy to figure that one out .bleeders are great tools for diagnoising your brake system use them wisely

yes air packs can leak fluid back to the air system and a bad air pack can give you no brakes if the valve that meters fluid to the air boost doesnt open it can cause a hydro lock .it has been talked about in other threads