故障现象：在不良道路上，后轴减震器会发出砰砰噪音。
Symptom: on bad roads, the rear axle shock absorber will make a popping noise.
涉及车型：所有BR213、205、238、253，257带特殊装备459/489。
Models involved: all br213, 205, 238, 253257 with special equipment 459 / 489.
故障原因：后减震器支撑轴承的问题。之前，后减震器支撑轴承和后减震器是作为整体备件一起提供的，后来，为了避免不必要的更换后减震器，后减震器支撑轴承也作为单独备件可以提供了，由此会带来一些意外的问题。
Fault cause: the rear shock absorber support bearing is faulty. Previously, the rear shock absorber support bearing and the rear shock absorber were provided together as integral spare parts. Later, in order to avoid unnecessary replacement of the rear shock absorber, the rear shock absorber support bearing can also be provided as a separate spare part, which will bring some unexpected problems.
处理措施：档后减震器出现噪音投诉时，先判断噪声来源，例如使用底盘耳诊断根据判断噪音的来源是减震器或支撑轴承。
Handling measures: when there is a noise complaint about the rear shock absorber, judge the source of the noise first. For example, use the chassis ear diagnosis to judge whether the source of the noise is the shock absorber or support bearing.
如果噪音来自减震器的上部件，则只要更换改进型支撑轴承就够了。否则必须更换整个减震器，包括支撑轴承。
If the noise comes from the upper part of the shock absorber, it is sufficient to replace the modified support bearing. Otherwise, the entire shock absorber, including the support bearing, must be replaced.
改进型支撑轴承在**次更换时，必须成对更换，以便确保排除混合安装的情况。
The improved support bearing must be replaced in pairs when * * times are replaced, so as to ensure that mixed installation is eliminated.
提示：松开活塞杆上的上部固定螺母时，规定强制使用下列专用工具。任何情况下都不得使用气动/冲击扳手松开活塞杆上的上部固定螺母，因为活塞杆会随之转动，损坏密封件。
Note: when loosening the upper fixing nut on the piston rod, the following special tools are mandatory. Under no circumstances should the upper fixing nut on the piston rod be loosened with a pneumatic / impact wrench, as the piston rod will rotate with it and damage the seal.
1、用开口宽度17拆卸标配螺母→专用工具W 164 589 00 10 00
1. Remove the standard nut with the opening width 17 → special tool w 164 589 00 10 00
2、用开口宽度16安装ET螺母→专用工具W 454 589 01 99 00（仅长款套筒扳手有开口宽度16）+开口宽度为5的市售长款内六角扳手。活塞杆上支持轴承六角螺母的拧紧扭矩为31Nm+/-3Nm。
2. Install et nut with opening width 16 → special tool w 454 589 01 99 00 (only long socket wrench has opening width 16) + Commercial Long Allen wrench with opening width 5. The tightening torque of the hexagon nut of the support bearing on the piston rod is 31nm + / - 3nm.
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