Corn4all

I recently had my brake booster replaced under warranty and now my pedal is super soft and goes all the way to the floor. The brake performance is ok but the pedal feel is terrible. The dealership says that's the way it's supposed to be but I have owned the car for 3 years and know that's not right. Any one have this problem and how was it corrected. 2012 Edge Sport Fwd 62000 miles