Service Brake Pressure Is High
问题：行车制动器和减速器驱动压力超出技术规格
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| 可能的部件根源 | 非部件根源 | 如何诊断 | 修正措施 |
|---|---|---|---|
| 制动泵进口未正确卡紧 | 系统内有空气 | 包括踏板的排气系统和测量压力 | 如果进口管路卡箍不正确，维修卡箍和排气系统。 |
| 分流器阀（前/后行车制动器） | 污染 调整不当 |
单独接合减速器和行车制动器，测量制动器组处的制动器应用压力，所有四个压力应都在公差范围内。 压力应降到 103 kPa（15 psi）以下。 如果减速器和行车制动器踏板都超出公差，更换继电器阀。 松紧调节器处的压力应比制动踏板先导压力低 240 +/- 35 kPa（35 +/- 5 psi）。 如果继电器阀上的弹簧偏置量过低，制动器压力将偏高。 （如果安装了 XLP 机组，则前制动器松紧调节器压力将低于制动踏板压力 193 +/- 35 kPa。） | 用新 ARC 电磁阀进行维修。 制动器踏板阀规格（6500 至 6900kPa 稳态最大压力） |
| 制动踏板阀 | 污染 | 执行制动系统压力检查。 制动踏板先导压力必须符合技术规格。 如果压力超出规格，排放制动系统（包括踏板）。 | 用新踏板阀进行维修。 确保机油为 ISO 18/15 或更高等级。 |
| 电磁阀（自动减速器控制） | 污染 | 单独接合减速器和行车制动器，测量制动器组处的制动器应用压力，所有四个压力应都在公差范围内。 压力应降到 103 kPa（15 psi）以下。 如果只有减速器阀超出公差，确定电流和上游电气系统。 如果踏板先导压力和继电器弹簧偏置量正确，但是带手动减速器的制动器压力和/或 ARC 压力不正确，则前或后 ARC 电磁阀可能存在问题。 | 用新 ARC 电磁阀进行维修。 确保机油为 ISO 18/15 或更高等级。 |
| 松紧调节器卡住 / 卡死 | 污染 | 仅限于流过松紧调节器中的补偿活塞的机油。 制动器压力可能在 2-8 秒内偏高或不稳定。 | 更换有故障的松紧调节器 |
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