geo6.......You more than likely have another issue which is very common to Monaco. It's the parking brake alarm. There is a small switch on the bottom end of your parking brake knob (the switch can be seen when you remove the panel near the driver's left leg) that is about the size of your thumb. This alarm will sound, or continue to sound when you put the coach in gear and then release the parking brake. If adding fluid doesn't solve your issue, here is a test for the switch alarm. If the alarm continues to sound, pull the parking brake back on and then shove it down firmly. This will usually shut it off and tell you that the switch needs to be replaced.
If your switch is bad, it can be ordered from Monaco. The company that makes the switch makes a dozen of them in different configurations and makes it difficult to buy the correct one. Monaco charges about $50.00 - $55.00 for the switch, including shipping. It's not hard to replace, just difficult to get to.
If you go to the Monaco forum on this website and do a switch for brake alarm, you'll find several posts with pictures.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab