GM Master Brake Cylinder Defect Alert (Short)

We are investigating reported concerns involving certain 2025 General Motors vehicles relating to alleged defects affecting the vehicles' master brake cylinder assemblies and braking systems. If your vehicle is affected, you may contact us confidentially and free of charge.

No lawsuit has been filed and no class proceeding has been certified in British Columbia.

GM Master Brake Cylinder Defect Investigation (Detailed)

Our firm is reviewing reported concerns involving certain 2025 General Motors vehicles relating to alleged defects affecting the vehicles' master brake cylinder assemblies and braking systems. If you have experienced brake system warnings, brake assist failures, reduced braking performance, or related issues, you may contact us confidentially and free of charge.

No lawsuit has been filed and no class proceeding has been certified in British Columbia.

Potential Automotive Class Proceeding Under Investigation:

GM Master Brake Cylinder Defect and Brake Failure Issues (Main)

Our firm is currently investigating a potential Canada-wide class proceeding in British Columbia concerning certain:

−      2025 Chevrolet Traverse

−      2025 GMC Acadia

−      2025 Buick Enclave

−      2025 Chevrolet Colorado

−      2025 GMC Canyon

vehicles and reported issues affecting the vehicles' master brake cylinder assemblies and braking systems.

We have received and reviewed reports indicating that certain affected vehicles may experience premature failure of the master brake cylinder assembly, a critical braking component responsible for converting brake pedal input into hydraulic braking force.

According to reports reviewed to date, affected vehicles may display various warning indicators and messages, including brake system warnings, ABS warnings, electronic stability control warnings, and "Service Brake System" or "Service Brake Assist" notifications. Owners have also reported instances of unusually stiff brake pedals, brake pedals sinking toward the floor, loss of brake assist, reduced braking effectiveness, and, in some circumstances, partial or complete loss of braking capability.

Our firm is reviewing whether internal defects within the master brake cylinder assembly may cause sudden degradation of hydraulic brake pressure, potentially impairing the vehicle's ability to safely slow or stop.

Reports reviewed to date suggest that many affected vehicles allegedly experienced these issues at relatively low mileage, in some instances within weeks or months of delivery. Reports also indicate that some owners have experienced extended delays obtaining replacement parts and repairs.

Because the alleged defect concerns a critical vehicle safety system, our firm is reviewing whether the reported condition may increase the risk of collisions, property damage, personal injury, or other losses.

Our firm is also reviewing publicly available information concerning prior service actions, warranty repairs, customer complaints, and whether similar brake system concerns were known before the sale of affected vehicles.

This investigation is ongoing and is being conducted to determine whether the legal requirements under British Columbia's Class Proceedings Act are met, including whether common issues exist and whether a class proceeding would be the preferable procedure.

If you own or lease one of the vehicles identified above and have experienced brake warnings, brake assist failures, loss of braking performance, repeated brake repairs, or related concerns, you may contact our firm to share your experience. Providing information is confidential, free of charge, and does not obligate you to retain our firm or participate in any legal proceeding.

This page will be updated as our investigation progresses.

This webpage is provided for informational purposes only and does not constitute legal advice.

Frequently Asked Questions – GM Master Brake Cylinder Defect Investigation

What is the issue being investigated?

Our firm is reviewing reports that certain 2025 General Motors vehicles may contain defects affecting the master brake cylinder assembly and braking system, potentially resulting in brake warnings, reduced braking performance, or loss of braking capability.

Has a class proceeding been filed?

No. At this time, our firm is only conducting a preliminary investigation. No Notice of Civil Claim has been filed and no class proceeding has been certified in British Columbia.

What does "certification" mean?

Certification is a procedural step where the Supreme Court of British Columbia decides whether a lawsuit may proceed as a class proceeding. Certification addresses procedural issues such as commonality of claims and whether a class proceeding is the preferable procedure. It does not determine liability or damages.

Which vehicles are included in the investigation?

The investigation currently concerns:

−      2025 Chevrolet Traverse

−      2025 GMC Acadia

−      2025 Buick Enclave

−      2025 Chevrolet Colorado

−      2025 GMC Canyon

The scope of the investigation may evolve as additional information becomes available.

What symptoms have been reported?

Reported symptoms may include:

−      Brake system warning lights;

−      ABS warnings;

−      Electronic stability control warnings;

−      "Service Brake System" messages;

−      "Service Brake Assist" messages;

−      Hard or stiff brake pedals;

−      Brake pedals sinking toward the floor;

−      Reduced braking performance;

−      Loss of brake assist; and

−      Partial or complete loss of braking capability.

Could the issue affect vehicle safety?

According to reports reviewed to date, the alleged defect may impair braking performance and, in some circumstances, may affect a driver's ability to safely stop the vehicle.

Has GM issued a recall?

We are reviewing publicly available information regarding service actions, technical bulletins, warranty repairs, and other manufacturer communications concerning the reported issue.

No recall has yet been issued.

What damages are being investigated?

We are investigating potential claims relating to diminished vehicle value, repair expenses, towing charges, rental vehicle costs, loss of use, and other losses that may be associated with the alleged defect.

How can I provide information to the firm?

If you own or lease one of the vehicles identified above and have experienced brake-related issues, you may contact our firm to share your experience. This is confidential, free of charge, and does not obligate you to participate in any legal proceeding or retain our firm.

Will I automatically be part of a class proceeding if one is certified?

Individuals who fall within the class definition are typically included automatically unless they choose to opt out, subject to the court's order.