政策法规现行有效美国跨境陆运

§ 393.53 Automatic brake adjusters and brake adjustment indicators.

效力	法规类型	发布日期	生效日期	发文机构
现行有效	部门规章	2026-02-19	2026-03-23	Code of Federal Regulations (CFR) - Transportation (Title 49)

发布02-19

生效03-23

摘要总结AI 辅助解读

本条款规定美国商用车辆（CMV）制动调节器及指示器的技术标准。要求1993年10月20日后生产的液压制动系统及1994年10月20日后生产的气压制动系统，必须符合FMVSS No. 105或No. 121关于自动制动调节的要求。此外，装有外露推杆气压制动系统的车辆必须配备符合标准的制动调节指示器。该法规直接影响跨境陆运车辆的合规性检查与准入资格，建议核实车辆出厂日期及制动系统配置是否满足上述特定时间节点的技术标准。

(a) Automatic brake adjusters (hydraulic brake systems). Each commercial motor vehicle manufactured on or after October 20, 1993, and equipped with a hydraulic brake system, shall meet the automatic brake adjustment system requirements of Federal Motor Vehicle Safety Standard No. 105 (49 CFR 571.105, S5.1) applicable to the vehicle at the time it was manufactured.
(b) Automatic brake adjusters (air brake systems). Each commercial motor vehicle manufactured on or after October 20, 1994, and equipped with an air brake system must meet the automatic brake adjustment system requirements of Federal Motor Vehicle Safety Standard No. 121 (49 CFR 571.121, S5.1.8 or S5.2.2) applicable to the vehicle at the time it was manufactured.
(c) Brake adjustment indicator (air brake systems). On each commercial motor vehicle manufactured on or after October 20, 1994, and equipped with an air brake system which contains an external automatic adjustment mechanism and an exposed pushrod, the condition of service brake under-adjustment must be displayed by a brake adjustment indicator conforming to the requirements of Federal Motor Vehicle Safety Standard No. 121 (49 CFR 571.121, S5.1.8 or S5.2.2) applicable to the vehicle at the time it was manufactured.

[60 FR 46245, Sept. 6, 1995, as amended at 77 FR 46639, Aug. 6, 2012]