DOT3和DOT4剎車油的主要區別在于它們的干濕沸點不同，這也就是我們常說的“平衡回流沸點”和“最低濕沸點”。在中國的強制性標準GB 12981-2003《機動車制動液》中，根據平衡回流沸點將制動液分為DOT3和DOT4兩種規格，對應的沸點分別為≥205℃和≥230℃。如果制動液的沸點過低，可能會在制動系統中汽化，形成氣鎖，導致車輛制動延遲甚至失效。拓牌剎車油生產廠家

      DOT3一般為醇醚(mi)型。 醇醚I型(xing)的(de)化學成(cheng)分主要是低(di)聚(ju)乙二(er)醇或丙(bing)二(er)醇，具有很強的(de)親水(shui)(shui)性(xing)，因此在使用或儲存(cun)過(guo)程中(zhong)其含水(shui)(shui)量會逐漸增加。 剎車(che)油的沸點會隨著含水(shui)量的增加而(er)降(jiang)低(di)，其制動性能也會相應降(jiang)低(di)。 當發現需要用力踩剎(cha)車(che)才能實現制動時(shi)，一個(ge)可能的(de)(de)原因是剎(cha)車(che)油的(de)(de)含(han)水量過高。 剎車油通常每兩年更換一次。拓牌剎車油生產廠家

      DOT4一般為酯類。酯型是以醇醚型為基礎，加入大量硼酸酯。硼酸酯是由低聚乙二醇或丙二醇與硼酸酯化而成。硼酸酯的沸點高于聚乙二醇或丙二醇，因此其制動性能更好。硼酸酯還具有很強的防潮性，可以分解吸收的水分，從而減緩吸水導致的沸點下降。因此，酯型的性能優于醇醚型，價格也較高。拓牌剎車油生產廠家

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