One problem related to brake sensor has been reported for the 2014 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2014 GMC Sierra 1500 based on all problems reported for the 2014 Sierra 1500.
Due to a problem with brake booster vacuum sensor and brake booster large vacuum leak, extra pressure is needed to apply brakes. Brakes are essentially non existent in vehicle. Problem diagnosed by dealer. Dealer states this is not a normal problem with the braking system. This is a safety issue especially when driving and this unexpectedly happens. Vehicle was in motion when this happened driving at approximately 45 mph. I understand this was a similar problem with the 2014 malibu. Replacement parts are on order unknown when expected due to this not being a part regularly replaced (per dealer).