1.1 本试验方法包括使用规范中描述的标准参考试验轮胎(SRTT)对铺装表面的峰值制动系数(PBC)的测量 F2493 这代表了乘用车子午线轮胎的当前技术。给出了确定与表面条件无关的峰值制动系数的一般测试程序和限制。实际的表面测试条件由用户在测试时确定和控制。规定了测试和表面状况文件程序和细节。该测量量化了测试时的峰值制动系数，并且不一定代表最大值或固定值。 1.2 有许多公开的规范参考ASTM E1337 PBC标准，在确定峰值制动系数时假设E1136 SRTT。用于将使用F2493 SRTT收集的数据转换为旧的E1136规范，以及将旧的E1136规范转换为与F2493数据一起使用的相关方程包含在 12.4 . 1.3 该测试方法利用表示在经过路面的制动测试轮胎上的峰值制动力的测量值。该试验是在轮胎的主平面平行于其运动方向并垂直于路面的情况下，在额定垂直载荷下以恒定速度进行的。 1.4 利用本文所述的设备和程序获得的测量的峰值制动系数可能不一定与通过其他表面系数测量方法获得的峰值制动系数一致或直接相关。 1.5 以英寸-磅单位表示的值应被视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准。1.6 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 路面具有不同的牵引特性，这取决于许多因素。表面纹理、粘合剂含量、使用、环境暴露和表面条件（即湿、干）是一些因素。5.2 测量值表示乘用车上运行的一般类型轮胎的峰值制动系数，在用户定义的表面条件下，用牵引的测试拖车在规定的路面上获得。这样的表面条件可以包括用于润湿路面的水深和水施用方法的类型。这些条件的变化可能会影响测试结果。

1.1 This test method covers the measurement of peak braking coefficient (PBC) of paved surfaces using a standard reference test tire (SRTT) as described in Specification F2493 that represents current technology passenger car radial tires. General test procedures and limitations are presented for determining peak braking coefficient independent of surface conditions. Actual surface test conditions are determined and controlled by the user at the time of test. Test and surface condition documentation procedures and details are specified. This measurement quantifies the peak braking coefficient at the time of test, and does not necessarily represent a maximum or fixed value. 1.2 There are many specifications published that refer to the ASTM E1337 PBC Standard assuming the E1136 SRTT in determining peak brake coefficient. Correlation equations for converting data collected using an F2493 SRTT to the older E1136 specification, and converting an older E1136 specification for use with F2493 data, are included in 12.4 . 1.3 This test method utilizes a measurement representing the peak braking force on a braked test tire passing over a road surface. This test is conducted with a tire under a nominal vertical load at a constant speed while its major plane is parallel to its direction of motion and perpendicular to the pavement. 1.4 The measured peak braking coefficient obtained with the equipment and procedures stated herein may not necessarily agree or correlate directly with those obtained by other surface coefficient measuring methods. 1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Pavement surfaces have different traction characteristics, depending on many factors. Surface texture, binder content, usage, environmental exposure, and surface conditions (that is, wet, dry) are some of the factors. 5.2 The measured values represent peak braking coefficients for tires of the general type in operation on passenger vehicles, obtained with a towed test trailer on a prescribed road surface, under user-defined surface conditions. Such surface conditions may include the water depth used to wet the road surface and the type of water application method. Variations in these conditions may influence the test results.