BEIJING — If you’ve ever fixed your own car brakes, the part you bought could very well have been made by Chinese auto parts supplier Judy Zhang. 

Zhang’s company, which is based in the eastern Chinese city of Qingdao and supplies brake hoses for thousands of car models in the U.S., is among those targeted by a 25% U.S. tariff on imports of automobiles, including automobile parts, that is set to take effect Thursday.

That’s on top of a 25% tariff imposed during President Donald…