Sounds like you have an automatic load-leveling system and there's a small leak. Once you turn on the ignition switch and all the doors are closed, the system will pump up again. It's normal for those systems to leak down a little, especially when the car sits for more than a day, but if this is something new for your car, the size of the leak may get worse making it easier to find. Typically your mechanic will spray a soapy water solution on the hoses and the bubbles will show the location of the leak.
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Friday, June 28th, 2013 AT 9:15 PM