Brake Light On problems of the 2008 Ford F-350

Hi, my name is [xxx] , my truck is 2008 Ford f350 super duty diesel 6. 4l lariat dually. When I bought my truck it had 57,000 mile and I use it to two big trailers to transport furnitures out of the state texas. Last week while I was pulling my loaded trailer on the highway in irving texas going to new orleans la driving 60 mph on the highway, something told me to stop and get some water from the my cooler at the back seat because I will not stop for at least 200 mile. As I slowed down and pulled off the highway, when I reach 15 miles per hour the truck would not stop so I push hard on the brake and my foot went all the way down to the floor and my heart went down with it, I had to use the emergency brake, low gear 1, and go on the grass to stop my truck. A mobile mechanic came and said I never seen this before, your break booster ears are one broke off and the other one is very loose. ( where the master cylinder connect to the brake booster. He tightened on bolt and told me to follow him to Ford dealer 3 miles down the road, using the brake very lightly, driving slow and rely mostly on the trailer brakes. We went to west way Ford at first did not want to diagnose my truck, and told me I have to wait 3 days because they are behind and they could not help me now. I told him that I am lucky to be a life and talking to you now, he replied other customers have to wait and you do too! so I called Ford motor company and I spoke with kelly, she took down the report and told me after the technician finish diagnosing you truck we will see what we can do. They ask west way Ford (vince grazioso to look and diagnose the problem and told me I need to pay to replace my brake booster,. They said your truck is out of warranty and it cost you $1289. 00 to replace the brake booster and to change the air filter, and the diesel filter like if thats. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).