GM Faces Class Action Over Brake Vacuum Pump Failures in Chevrolet Equinox, GMC Terrain, and Buick Envision
A newly filed federal class action lawsuit alleges that General Motors knowingly sold vehicles equipped with a dangerously defective brake vacuum pump system that can cause sudden loss of braking power — sometimes at highway speeds.
The case, filed in the United States District Court for the Eastern District of Michigan, targets certain 2016–2022 GM compact SUVs, including the Chevrolet Equinox, GMC Terrain, and Buick Envision. According to the complaint, the defect can cause the brake pedal to become “hard as a rock,” significantly increase stopping distances, and in some cases cause catastrophic internal engine damage.
If you own or lease one of these vehicles, this is a developing situation you should understand.
What’s the Problem?
The lawsuit alleges that certain GM vehicles contain a defective mechanical brake vacuum pump system.
Modern vehicles use power brake assist to help drivers stop safely. In these vehicles, a camshaft-driven mechanical vacuum pump creates the vacuum necessary for the brake booster to multiply the driver’s pedal force.
According to the complaint, the brake vacuum pump in the affected vehicles:
Loses vacuum pressure during normal operation
Overworks itself attempting to compensate
Suffers accelerated internal wear
Eventually seizes or catastrophically fails
When the pump fails, drivers allegedly experience:
A brake pedal that becomes extremely stiff
Sudden loss of power brake assist
Dramatically increased stopping distance
“Service Brake Assist” warning messages (often after the failure occurs)
The lawsuit further claims that when the internal components of the pump fracture, metal debris can enter the engine, damaging the camshaft, timing components, and other internal parts — sometimes resulting in thousands of dollars in repairs.
The complaint specifically identifies:
2016–2020 Buick Envision
2018–2022 Chevrolet Equinox
2018–2022 GMC Terrain
Allegations
The class action complaint alleges that GM:
Knew of the brake vacuum pump defect as early as 2017
Issued internal stop-delivery orders and Technical Service Bulletins
Monitored NHTSA complaints documenting brake failures and crashes
Failed to issue a recall
Continued selling vehicles without disclosing the defect
The lawsuit cites more than 300 NHTSA complaints describing sudden brake assist loss, hard brake pedals, near-miss collisions, and reported crashes.
Drivers describe:
Losing braking power at highway speeds
Having to apply extreme force to stop
Being forced to steer off the roadway
Engine shutdown following vacuum pump failure
The complaint also alleges that GM quietly redesigned later model vehicles to eliminate the vacuum pump system in favor of an electro-hydraulic brake system — while leaving existing owners to bear repair costs.
The plaintiffs assert claims for:
Breach of warranty
Fraudulent concealment
Unjust enrichment
Violations of consumer protection statutes
Recall / TSB
As of the filing of the lawsuit, there is no nationwide recall covering all affected vehicles for brake vacuum pump failure.
Owners report dealerships diagnosing:
Seized vacuum pumps
Internal gear fractures
Camshaft damage
Timing chain and actuator damage
Some GM Technical Service Bulletins reportedly addressed brake assist warnings and vacuum loss symptoms. However, according to the lawsuit, GM allegedly characterized some issues as software anomalies rather than acknowledging a mechanical design defect.
If no recall applies to your VIN, you may still be experiencing the underlying issue.
Symptoms
Owners of affected vehicles commonly report:
Brake pedal becomes extremely hard
Vehicle requires excessive force to stop
“Service Brake Assist” warning
“Engine Power Reduced” message
Grinding or unusual noise from engine
Sudden engine shutdown
Metal debris found in engine during repair
Expensive camshaft or timing system repairs
These failures often occur without prior warning.
If your brake pedal suddenly becomes stiff or difficult to depress, treat it as a serious safety issue.
How to Proceed
Document the Failure: Keep all repair invoices, diagnostic reports, and tow bills. Ensure that dealership repair orders specifically reference brake vacuum pump failure if applicable.
Preserve Damaged Parts: If possible, request return of the failed vacuum pump and internal components. Photographs of shattered pump housings or metal debris can be important evidence.
Check for Open Recalls: Run your VIN through the NHTSA recall database and GM’s recall lookup tool.
Track Out-of-Service Days: If your vehicle remains at the dealership awaiting diagnosis or repair, maintain detailed records of downtime.
Do Not Ignore Brake Symptoms: If the pedal becomes hard or stopping distance increases, avoid continued driving until inspected.
Speak With a Lemon Law Attorney, like Valero Law: If repairs are denied, repeated, or the vehicle suffers major engine damage tied to the brake system, you may have legal remedies.
What This Means for California Owners
Under California’s Song-Beverly Consumer Warranty Act (California Lemon Law), a vehicle may qualify as a lemon if:
The manufacturer cannot repair a defect after a reasonable number of attempts; or
The vehicle is out of service for more than 30 cumulative days; or
The defect substantially impairs use, value, or safety.
A sudden loss of braking assist is unquestionably a safety-related defect.
Even if your vehicle is outside the original factory warranty, you may still have claims depending on timing, mileage, and repair history.
Call Valero Law
If you own a Chevrolet Equinox, GMC Terrain, or Buick Envision that has experienced brake vacuum pump failure, sudden loss of braking power, or engine damage related to the vacuum system, you may be entitled to relief under California Lemon Law.
Compensation may include:
A full repurchase of your vehicle
A replacement vehicle
Or a substantial cash settlement
Valero Law, APC handles California lemon law claims on a contingency basis. That means there is no cost to you, and the manufacturer pays our fees if we win.
Call Valero Law, APC at (424) 299-4447 or complete our free Lemon Law case evaluation today.