general problems of the 2004 GMC Sierra

While driving, needed to slow down for traffic light and the brake pedal went to the floor. I was able to still drive it, as the brakes would stop the truck eventually. Cause was the rusted rear brake line that ruptured. Cost to fix was $400. 00 in addition, on 12. 27. 13, I had the front wheel bearing replaced at a cost of $525. 00. The truck only has 66,600 miles on it.