Lexus ES350 brake pedal occasionally goes to floor in cold weather, master cylinder replaced on Lexus ES350

Some Lexus ES350 owners report experiencing issues with the brake pedal occasionally going to the floor in cold weather, even after replacing the master cylinder. These problems can be exacerbated by low brake fluid levels, which may lead to a spongy pedal feel. Additionally, owners should inspect the brake system for leaks, as any leaks can cause the pedal to drop when braking. It's also crucial to ensure that the newly replaced master cylinder is functioning correctly and free from internal damage or leaks, as a faulty master cylinder can contribute to a soft brake pedal. Furthermore, some owners may find that malfunctions in the brake booster can affect braking performance, and air trapped in the brake system can lead to similar issues. Properly bleeding the brakes, including an ABS bleed if necessary, is recommended to eliminate any air in the system. Addressing these factors is essential for troubleshooting and potentially resolving the brake pedal issue.