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Converting to Vacuum brake booster on a #2500 truck will exasperate your brake problems, Hydro boost is a very good system and has been around for a long time. Unless you cobbel something up the brake system wont work properly and due to low engine vacuum on HD trucks you will not have enough vacuum to operate the booste when you need it. Fix the ABS system properly and your problems will go away. Have the system checked for codes and a code reader wont read body or ABS codes so you will need a scanner such as Tech 2 or similar scanner.
 
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