3噸內燃叉車對制動液性(xing)能的要(yao)求：

(1)良好的(de)低溫性能：制動液(ye)在低溫時(shi)(shi)流動性差，容易凝(ning)固，管(guan)路(lu)、泵等(deng)堵(du)塞(sai)，制動時(shi)(shi)制動踏板變硬，不踩下就無(wu)法制動。通常，制動液(ye)要求在-40下不凝(ning)固，而是自由流動。

(2)合(he)適的粘度(du)：粘度(du)過大，低溫(wen)流動性變差，制動性能下降的粘度(du)太小，在高溫(wen)環境(jing)下不能可靠地潤滑(hua)(hua)，容易泄漏。 為了確(que)保制動缸(gang)和橡膠(jiao)碗(wan)順利滑(hua)(hua)動，制動液(ye)要(yao)求有適當的粘度(du)。

(3)沸(fei)(fei)點(dian)(dian)(dian)高：叉車每循環頻繁前進和后退，制(zhi)(zhi)(zhi)動(dong)(dong)(dong)(dong)摩(mo)擦片長時(shi)間處(chu)于制(zhi)(zhi)(zhi)動(dong)(dong)(dong)(dong)狀態，使制(zhi)(zhi)(zhi)動(dong)(dong)(dong)(dong)系(xi)統(tong)的溫度上升，使用沸(fei)(fei)點(dian)(dian)(dian)低容易蒸發的制(zhi)(zhi)(zhi)動(dong)(dong)(dong)(dong)液(ye)時(shi)，局部制(zhi)(zhi)(zhi)動(dong)(dong)(dong)(dong)系(xi)統(tong)的配管內充滿(man)制(zhi)(zhi)(zhi)動(dong)(dong)(dong)(dong)液(ye)蒸汽， 因此，制(zhi)(zhi)(zhi)動(dong)(dong)(dong)(dong)液(ye)要求高沸(fei)(fei)點(dian)(dian)(dian)(干沸(fei)(fei)點(dian)(dian)(dian)是制(zhi)(zhi)(zhi)動(dong)(dong)(dong)(dong)液(ye)不含(han)水(shui)時(shi)的沸(fei)(fei)點(dian)(dian)(dian)，濕沸(fei)(fei)點(dian)(dian)(dian)是制(zhi)(zhi)(zhi)動(dong)(dong)(dong)(dong)液(ye)含(han)有(you)一定水(shui)分的沸(fei)(fei)點(dian)(dian)(dian))和低蒸發性，減少(shao)氣體阻隔的發生。