Brake system defect faults seriously affect the safety of drivers and passengers, which is one of the main reasons for the recall of defective automobile products. In order to study the failure regularity of brake system defect products and obtain the product failure mode, the data of the automobile product recall caused by the brake system defect in the past five years was studied by using the Pareto Diagram. The research results show that the key factor of the assembly of the brake system defects that leads to the recall of automobile products is the brake universal device. The key factors of the failure mode are degradation or loss of function failure modes, and damaged failure mode.