Brake Loud Noise problems of the 2012 Chevrolet Sonic

I was driving down a 7% grade going down hill at 50 miles an hour my car shut off, steering locked and brakes didn't work the only thing I could use was the emergency brake if I wasn't calm and used my head me and my son would have died. My car now is making a loud noise and shaking after it warms up. My shifter gets stuck and I cant park or take my key out. Everything in this car is an alarm for danger or death. I've called the dealership and they don't return my calls. I finally got a hold of them and they said I can bring it in but its not covered under warranty. We don't have that kind of money for repairs like this.

When I am slowing and there is a grate in the street, my vehicle has problems braking. This has happened numerous times every time I am on a grate, which is fairly common in the city. I told jim butler and they advised me that there was nothing wrong with the brakes (they were doing an oil change and said they checked the brakes). When I drive over ice, it makes a loud noise and there appears to be a problem braking.