NHTSA Complaint #11551171 — 2016 CHEVROLET SILVERADO 1500

The truck has had its major service to replace all fluids at 70,000 miles. One of the services was a notable vibration and shaking through the steering wheel and on the brakes. Higher the speed the more the vibration. When brakes are applied the vibration gets worse. The vehicles brakes and rotors were checked and good. The mechanic said that the brake pump was slightly loose and it was tightened. It did slightly ease the vibration, but less that a few days later it is back to the same vibrating. The brake power feels weak and when I need to brake I feel like the vehicle is not stopping. I have owner a 2014 Silverado before this and did not have this issue. I took it back to the dealer and they did an alignment which did not help.