I have a 2011 Dodge Grand Caravan, 185k miles, automatic. Recently the past few days I noticed the brake light has been coming and going and the pedal is going almost to the floor. I had a brake booster job done about 4 months ago, I brought my car to one place I haven't been before they said I needed a flush, I took the car over to the same place I had the brake booster job which is under warranty and I've always been in good standing with them and they said I need a master cylinder job done. I was told the brake fluid level is full and all components of brake system are in proper function so this must be the problem. Any thoughts on if this sounds like it could be the correct issue or something else? any help is appreciated thanks