My issue is my air tanks (front and rear) go down the same amount. I changed a leaking height valve due to the drivers side rear air bag deflated over night. The compressor kicks off at 120, a day later both my gauges are down to 40. All the bags still have air in the. I installed all new air bags due to age last week, checked all the lines and bags with soapy water, can’t find any leaks. I’m pretty sure both my tanks are behind the front axle. Question is there a line for driver side and passenger side air bags or do they use the same air line for both sides. Is there check valves to isolate the air tanks from leaking air into each. Thanks.