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Wrench
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Fuel
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If your truck or bus has dual parking control valves, it means that you can use pressure from a separate tank to:
If your truck or bus has dual parking control valves, it means that you can use pressure from a separate tank to:
  • Balance the service brake system.
  • Stay parked without using up service air pressure.
  • Apply more brake pressure if the main tank is getting low.
  • Release the spring brakes to move a short distance.