故障現象：在不良道路上，后軸減震器會發出砰砰噪音。
Symptom: on bad roads, the rear axle shock absorber will make a popping noise.
涉及車型：所有BR213、205、238、253，257帶特殊裝備459/489。
Models involved: all br213, 205, 238, 253257 with special equipment 459 / 489.
故障原因：后減震器支撐軸承的問題。之前，后減震器支撐軸承和后減震器是作為整體備件一起提供的，后來，為了避免不必要的更換后減震器，后減震器支撐軸承也作為單獨備件可以提供了，由此會帶來一些意外的問題。
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.
處理措施：檔后減震器出現噪音投訴時，先判斷噪聲來源，例如使用底盤耳診斷根據判斷噪音的來源是減震器或支撐軸承。
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.
如果噪音來自減震器的上部件，則只要更換改進型支撐軸承就夠了。否則必須更換整個減震器，包括支撐軸承。
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.
改進型支撐軸承在**次更換時，必須成對更換，以便確保排除混合安裝的情況。
The improved support bearing must be replaced in pairs when * * times are replaced, so as to ensure that mixed installation is eliminated.
提示：松開活塞桿上的上部固定螺母時，規定強制使用下列專用工具。任何情況下都不得使用氣動/沖擊扳手松開活塞桿上的上部固定螺母，因為活塞桿會隨之轉動，損壞密封件。
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、用開口寬度17拆卸標配螺母→專用工具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、用開口寬度16安裝ET螺母→專用工具W 454 589 01 99 00（僅長款套筒扳手有開口寬度16）+開口寬度為5的市售長款內六角扳手。活塞桿上支持軸承六角螺母的擰緊扭矩為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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