An Acura ILX master cylinder failure investigation has been closed after the automaker recalled the vehicles.
The National Highway Traffic Safety Administration opened the investigation in October 2025 following complaints from 2019-2020 Acura ILX owners.
The complaints allege the ILX master cylinder failures caused the brake pedals to fall to the floorboards, and some owners complained the brake pedals felt soft and needed to be pumped to stop the vehicles.
Honda/Acura investigated the complaints and found residual plasticizer in the brake reservoir hose which could contaminate the brake fluid. This contaminated brake fluid was absorbed by the secondary cup seal which caused the seal to swell.
The engine heat from the Acura ILX also expanded the swollen seals which allowed brake fluid to bypass the master …
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