General Motors LLC faces a proposed class action filed on February 18, 2026, in the U.S. District Court for the Eastern District of Michigan. The suit alleges the automaker failed to fully warn owners about a brake vacuum pump defect that can cause sudden loss of power assist.
Highlights
- Vacuum pump failure leads to hard or unresponsive brake pedal with reduced stopping power
- Defect can occur without warning during normal driving and affects emergency braking
- GM issued multiple technical service bulletins on vacuum and booster issues starting in 2017
- Three named plaintiffs seek nationwide class certification, damages and vehicle repairs
Lawsuit Filing Details
The case is titled Thieme et al v. General Motors LLC, case number 2:26-cv-10570. Named plaintiffs are Kaylee Thieme, Rebecca Gill and Meghan Morley. The Miller Law Firm represents them. The complaint asserts claims under consumer protection and product liability laws. It demands a jury trial, monetary damages, and corrective action such as repairs or buybacks.
Public docket records list exhibits that include NHTSA owner complaints, GM service bulletins, owner forum posts on Terrain and Equinox vacuum pump failures, and related technical articles. No full complaint text is available free online at this time.
Alleged Brake System Defect
The defect involves the brake vacuum pump that supplies power assist to the brake booster. When the pump fails, the pedal becomes stiff or sinks, requiring much greater force to achieve braking. Drivers often see brake and ABS warning lights illuminate. The issue reportedly develops abruptly and can compromise safe stopping distances.
Court records reference GM technical service bulletins dating to March 2017 on vacuum pipe routing, March 2018 on brake booster replacement, and later notices addressing spongy pedals and stored diagnostic codes. Plaintiffs claim these steps did not eliminate the root cause across the vehicle population.
Affected Vehicles and Related Investigation
The allegations target certain crossover models equipped with the affected brake system. These include 2018-2024 Chevrolet Equinox and GMC Terrain vehicles, along with 2017-2021 Buick Envision models. Clarkson Law Firm is separately investigating identical symptoms of hard pedals and loss of braking power in these exact vehicles.
Owners have reported the pump failure in online forums dedicated to Terrain and Equinox models. Some cases note additional engine damage from pump debris. The defect directly impacts core safety systems relied upon by drivers.
Next Steps in Litigation
The case remains in its early stages in Michigan federal court under Judge Robert J. White. GM has not yet filed a public response. Plaintiffs pursue certification of a nationwide class of affected owners.
Industry professionals can track updates via court dockets. For the original Law360 coverage: https://www.law360.com/articles/2443170/gm-sued-over-alleged-defect-in-brake-system Full case docket summary: https://www.pacermonitor.com/public/case/63171904/Thieme_et_al_v_General_Motors,_LLC Clarkson Law Firm investigation page: https://clarksonlawfirm.com/lp/defective-general-motors-brake-booster-pump-investigation/
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