We have the same system. Verify in your manual but in mine, the proper procedure is as follows: This is MONACO specific so other mfgs may differ.
1. Park the coach as level as possible.
2. Deploy the SLIDES with full air.
3. Push the button twice. Coach will level and shut off. May or may not dump. Mine usually will not.
4. Continue your set up. After about 30 mins the coach will dump the air in the bags and relevel with the aux air compressor. Mines over the rear axle, yours may either be there or up front near the generator. Monaco moved it in later years, don't remember when because of the releveling noise at night.
When leaving, start the coach. When full air, press the travel button. Wait for the coach to completely air up. Turn off coach, pull in your slides and you're ready to go....Dennis