The brake master cylinder is the first component in a vehicle’s braking system, activated by depressing the brake pedal. The pedal pushes a piston through this cylinder, forcing brake fluid ...

The fix consists of removing the current, defective brake master cylinder and replacing it with a new one containing the correct internal cartridge seal. This should be applied to all 2025 Buick ...

As Service Bulletin N242482170 describes, affected 2024 Chevy Traverse units were produced with a brake master cylinder that is missing the internal cartridge seal in the eBoost module.

On certain passenger and sport utility vehicles equipped with anti-lock braking system, in extremely cold weather, the brake master cylinder seals can fail. If this occurs, the brake pedal can go ...