GM Recalls 3.5 Million Chevy Silverados, Cadillac SUVs and GMC Trucks

September 11, 2019 by Jerry Hirsch, @Jerryhirsch

General Motors announced a massive recall of nearly 3.5 million trucks and SUVs to correct a brake system defect.  

The recall includes the 2015-2017 Cadillac Escalade, 2014-2018 Chevrolet Silverado, GMC Sierra, 2015-2018 Chevrolet Suburban, Tahoe and GMC Yukon models.

The trucks and SUVs have a potential problem with the amount of vacuum created by the vacuum pump decreasing over time. The lowers the brake assist, increases braking effort and lengthens the distance it takes to stop the vehicle, according to the National Highway Traffic Safety Administration.

The automaker said the problem is more prevalent at low speed when softly applying the brakes. But that at all times, GM says the brakes continue to function and exceed federal motor vehicle requirements for braking power. 

GM said the vehicles’ vacuum assist pump is lubricated with engine oil, which flows into the pump through a filter screen. Under certain conditions and over a period of time, debris such as oil sludge can accumulate on the filter screen, potentially restricting the flow of oil into the pump and gradually reducing the amount of vacuum pressure generated. 

Owners who fail to adhere to GM’s recommended oil change intervals could be more likely to experience the problem. 

All of the trucks and SUVs have a secondary, hydraulic power brake assist system that activates to provide power brake assist if the vacuum drops. But that hydraulic brake boost assist is limited at lower speeds. 

GM dealers will reprogram the electronic brake control module in the vehicles with a new calibration. That improves how the system utilizes the hydraulic brake boost assist function when vacuum assist is depleted.

The automaker plans to notify owners but has not provided a timeline for the recall, NHTSA said. However, owners may contact Chevrolet customer service at (800) 630-2438, Cadillac customer service at (800) 458-8006 or GMC customer service at (800) 462-8782. GM’s number for this recall is N192268490.

Jerry Hirsch September 11, 2019
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