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Hi guys, I'm currently out on a roadtrip from Seattle to Glacier National Park. I just starting feeling an intense vibration while braking from about 60 mph. Thinking my rotors are warped. I pulled over to have a look and noticed a vacuum line under the passenger rear wheel well that had come loose and dragged on the ground. Just a thin black vacuum line. Van is running fine... It runs under the rear bumper and back around the driver side past the fuel tank. Anybody know what this is? Vibration got better after letting it cool down a few minutes. Thanks for any thoughts!