问：刹车在零以下的温度下无法正常工作

There are two brake booster vacuum check valves that will stick in cold weather for about a minute. These two valves supply vacuum to the brake booster and will cause reduced power assist to the brakes until they start to open and allow vacuum. The two vacuum check valves should be replaced with one with the new design. These were covered under a bulletin, but the bulletin is no longer active for free replacement. However, the parts should still be available. The old ones are white and the new ones are bigger and black in color. The valves are in the vacuum lines from the booster to the engine in two places in the line.Have your brake pedal problem inspected并由认证的技术人员修理，以确保您可以安全地回到路上。