Q: My abs light is on and my brake pedal goes to the floor.

Since the master cylinder is full and the brake pedal is going to the floor, there is a good chance the master cylinder has failed or there is a leak somewhere along the braking system. This leak may be found at the master cylinder itself, on a rusted line or one of the brake calipers may be leaking brake fluid. Consider hiring an experienced technician like one from YourMechanic who can come out to the vehicle for a closer inspection of the warning light and the circumstances causing it to offer a more personal diagnosis and estimate the proper repairs.