答：盤(pan)式制(zhi)(zhi)動(dong)(dong)器(qi)的(de)發熱(re)(re)部位集(ji)中(zhong)在(zai)(zai)很窄的(de)制(zhi)(zhi)動(dong)(dong)襯(chen)塊(kuai)上，其單位壓力又比鼓式制(zhi)(zhi)動(dong)(dong)器(qi)大(da)，制(zhi)(zhi)動(dong)(dong)襯(chen)塊(kuai)和鉗體的(de)活(huo)塞(sai)直(zhi)接接觸，因此制(zhi)(zhi)動(dong)(dong)時的(de)熱(re)(re)量極易傳(chuan)給制(zhi)(zhi)動(dong)(dong)液(ye)(ye)。這(zhe)樣，使(shi)(shi)盤(pan)式制(zhi)(zhi)動(dong)(dong)器(qi)容易產生(sheng)氣(qi)阻(zu)(zu)現象(xiang)。但(dan)是(shi)，若采取相(xiang)應(ying)的(de)措施，也(ye)可防止(zhi)氣(qi)阻(zu)(zu)現象(xiang)的(de)發生(sheng)。植物油型制(zhi)(zhi)動(dong)(dong)液(ye)(ye)無法滿足盤(pan)式制(zhi)(zhi)動(dong)(dong)器(qi)的(de)使(shi)(shi)用(yong)(yong)要求，因此必須使(shi)(shi)用(yong)(yong)高沸(fei)點(dian)的(de)合(he)成制(zhi)(zhi)動(dong)(dong)液(ye)(ye)。但(dan)是(shi)，合(he)成制(zhi)(zhi)動(dong)(dong)液(ye)(ye)具有吸水(shui)特性(xing)。在(zai)(zai)某些(xie)使(shi)(shi)用(yong)(yong)條件中(zhong)，沸(fei)點(dian)下降很快。為防止(zhi)制(zhi)(zhi)動(dong)(dong)液(ye)(ye)沸(fei)點(dian)的(de)明顯下降，一(yi)(yi)般常采用(yong)(yong)以下一(yi)(yi)些(xie)措施：(1)定期更換(huan)制(zhi)(zhi)動(dong)(dong)液(ye)(ye)。夏季3個月或(huo)行駛(shi) smart tags"/>5000km;冬季6個月或(huo)行駛(shi)1000km后，即將制(zhi)(zhi)動(dong)(dong)液(ye)(ye)更新。(2)不(bu)同性(xing)質的(de)制(zhi)(zhi)動(dong)(dong)液(ye)(ye)不(bu)可互換(huan)使(shi)(shi)用(yong)(yong)或(huo)混用(yong)(yong)。(3)密閉保存(cun)制(zhi)(zhi)動(dong)(dong)液(ye)(ye)。要限 制(zhi)(zhi)制(zhi)(zhi)動(dong)(dong)液(ye)(ye)溫(wen)度升(sheng)高，應(ying)保證活(huo)塞(sai)能(neng)靈(ling)活(huo)地自動(dong)(dong)回位，避免因銹(xiu)蝕、發卡(ka)使(shi)(shi)制(zhi)(zhi)動(dong)(dong)器(qi)打滑或(huo)發咬(yao)。當制(zhi)(zhi)動(dong)(dong)襯(chen)塊(kuai)磨耗過多時，傳(chuan)到(dao)制(zhi)(zhi)動(dong)(dong)液(ye)(ye)的(de)熱(re)(re)量也(ye)會迅速增加(jia)。
