This afternoon my wife had a brake issue. She was parked in a parking ramp and needed to move to another space. When attempting to back up, the brake pedal went almost all the way to the floor (maybe actually all the way, it was hard to tell) and the red Brake and Brake System warning lights on the lower right dash came on. When that happened, the car would not move but the parking brake was not on. Turning off and restarting the car once didn’t help, but the second time got the pedal back to a normal feel and the warning lights turned off. The car was then drivable. Subsequently she remembered one other time the brake pedal was not normal. Further, 2 days ago we heard a loud squeal from the car that lasted 2-3 seconds. Hard to tell just where it was located, but it could have been at one of the front wheels. I plugged in my code reader and found DTCs C1555 and P0004. The chassis code may be for an ABS sensor (?) but the P code makes no sense because it appears to be for the fuel system pressure. The earliest our dealer can get us in is 5 days from now, so we’ll hope the brakes are ok in the meantime. My guess is a defective/damaged ABS sensor. We'll have all the software updates installed at the same visit. Does anyone have a set of the DTCs? I can Google those individually, but I wondered if there is a list of any Clarity-specific codes?