The contact owns a 2014 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 19V645000 (Service Brakes, Hydraulic) however; the contact disregarded the letter. The contact stated that while attempting to parallel park, the brakes failed to operate properly. The contact stated that the brake pedal became abnormally stiff. The contact was able to operate the brake pedal and park the vehicle. The vehicle was then taken to a dealer for a routine oil change, and the vehicle was diagnosed with a non-functional vacuum pump. The vehicle was not repaired. The manufacturer was made aware of the failure; however, the contact was informed that the recall had expired. The failure mileage was approximately 135,000.

- Beach Park, IL, USA

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the brake pedal was depressed and became firm. Additionally, the vehicle failed to stop immediately. No warning lights were illuminated. The vehicle was taken to the dealer, who informed the contact that the vacuum pump had failed and needed to be replaced. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Number: 19V645000 (Service Brakes, Hydraulic). The manufacturer was not made aware of the failure. The failure mileage was 151,477.

- Iva, SC, USA

The contact owns a 2014 GMC Sierra 1500. The contact stated while driving approximately 60 MPH, as the contact slowed for traffic, the brake pedal became very hard to depress. The contact stated he had to use more than normal leg strength to depress the brake pedal. The contact stated no warning light was illuminated. The contact stated that the failure had become reoccurring. The contact stated that the failure of the brakes also occurred while starting the vehicle and shifting into either drive(D) or reverse(R). The contact had not taken the vehicle to a local dealer or mechanic. The vehicle had not been diagnosed or repaired. The manufacturer had been informed of the failure. The contact researched online and related the failure to NHTSA Campaign Number: 19V645000 (Service Brakes, Hydraulic). The failure mileage was approximately 189,000.

- Winnie, TX, USA