2018 GMC Terrain

The brakes stop working, they get really stiff and locks in the middle of the highway, very hard to stop and almost caused an accident, it is not the first time, the vehicle was serviced by an authorized mechanic and the problem had been resolved until today, the brakes locked and almost caused me to loose control of the vehicles brake system.

We were driving back from vacation and while on I-95 the brakes went out. The check engine light came on and the service brake assist light came on. My husband was able to pull off to the side of the road but if it weren’t for already starting to slow down due to an accident we were approaching this could have been much worse. When the brakes went out my husband could hardly press the brake peddle. After researching this appears to be a known issue amongst GM vehicles. It appears to be the vacuum pump that went out. There is an open recall for certain models of GM but not all. This was such a dangerous situation. We literally could have died. This should be a recall for all models as Terrains appear to be largely affected as well from this issue.

While driving on the interstate the brakes all the sudden stopped working. I was able to stop the vehicle by pulling over to the shoulder of the road. I received a warning saying service brake assist and a check engine light after the brakes went out. The vehicle later shut off and is no start with no warning codes. I am currently towing the vehicle to a mechanic. Several people claim to have the same issue online stating that it is an issue with the brake vacuum booster shearing off in the exhaust cam which then causes major damage to the engine. It appears the same issue exists with several other GMC models that were already recalled

While driving truck around 55mph with family in vehicle and tried to make a stop in a traffic light, notice truck had a hard brake pedal and did not stop, luckily I (Parent) around [XXX] of age was able to divert around and put on neutral until truck stoped in side of road. After a while of looking around and checking truck for system errors or lights there was no indication not warnings. i was able to move truck to a near by location and asked a mechanic to go look at it. Mechanic notice oil coming out of brake vacuum pump and took out part and mentioned that the pump had broken in pieces inside engine block and might need a replacement. Truck is still on shop and waiting for our decision to fix. At this point my family is so scared of this truck and don't even want to talk about the incident. Me as a parent is very concern on all this new vehicles that are suppose to be more reliable and better protection than older vehicles , i feel more protected in my 90’s truck. I hope this gets enough attention to at least save someone's life. Thanks in advance, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While driving the vehicle which only has 68,000 miles the reduced engine power warning light appeared. As quickly as was safe the car was pulled to the shoulder. It was towed to the dealer who states the Vacuum pump seized causing the camshaft phase actuator locating pin to spin. Originally they stated a new camshaft and vacuum pump were needed at $3,500, but now state the entire engine is damaged and must be replaced at cost of $12,000. The vehicle was well serviced and this manufacturing flaw lead to the vehicle be stopped on the road putting both the occupants and others around at risk.