The combined brake system (CBS) is a mechanism that links the front and rear brakes for scooters. For two-wheeled scooters, a CBS with appropriate braking force distribution can reduce the risk of crashing accidents due to insufficient driving proficiency. The design of the braking force distribution for a CBS is challenging to the designer because it has to fulfill many requirements such as braking performance, ride comfort, reliability, and low costs. This paper proposes a systematic method to optimize the parameters of CBS. The evaluation indexes for the design are first discussed. The steps to determine the critical parameter to meet the indexes and a method to predict braking performance are developed. Finally, driving tests are carried out to verify the effectiveness of the proposed method. Experimental results showed that the deceleration of the tested scooter equipped with the designed CBS achieves an average mean fully developed deceleration (MFDD) of 5.246 m/s², higher than the homologation requirement. Furthermore, the proposed method’s prediction of braking performance is in good agreement with the test results, with errors <1%.

组合制动系统（CBS）是一种连接踏板车前后制动器的机构。对于两轮滑板车来说，适当的制动力分配的CBS可以降低因驾驶熟练度不足而发生碰撞事故的风险。CBS 制动力分配的设计对设计者来说具有挑战性，因为它必须满足许多要求，例如制动性能、乘坐舒适性、可靠性和低成本。本文提出了一种优化CBS参数的系统方法。首先讨论设计的评价指标。开发了确定满足指标的关键参数的步骤和预测制动性能的方法。最后，通过驾驶测试来验证所提出方法的有效性。²、高于认证要求。此外，所提出的方法对制动性能的预测与测试结果非常吻合，误差<1%。