它由液壓控製
，主要零部件有製動盤、分泵
、製動鉗
、油(you)管(guan)等(deng)。製(zhi)動(dong)盤(pan)用(yong)合(he)金(jin)鋼(gang)製(zhi)造(zao)並(bing)固(gu)定(ding)在(zai)車(che)輪(lun)上(shang)，隨(sui)車(che)輪(lun)轉(zhuan)動(dong)。分(fen)泵(beng)固(gu)定(ding)在(zai)製(zhi)動(dong)器(qi)的(de)底(di)板(ban)上(shang)固(gu)定(ding)不(bu)動(dong)。製(zhi)動(dong)鉗(qian)上(shang)的(de)兩(liang)個(ge)摩(mo)擦(ca)片(pian)分(fen)別(bie)裝(zhuang)在(zai)製(zhi)動(dong)盤(pan)的(de)兩(liang)側(ce)。分(fen)泵(beng)的(de)活(huo)塞(sai)受(shou)油(you)管(guan)輸(shu)送(song)來(lai)的(de)液(ye)壓(ya)作(zuo)用(yong)，推(tui)動(dong)摩(mo)擦(ca)片(pian)壓(ya)向(xiang)製(zhi)動(dong)盤(pan)發(fa)生(sheng)摩(mo)擦(ca)製(zhi)動(dong)，動(dong)作(zuo)起(qi)來(lai)**好象用鉗子鉗住旋轉中的盤子
，迫使它停下來一樣。

        zhezhongzhidongqisanrekuai，zhongliangqing，gouzaojiandan，tiaozhengfangbian。tebieshigaofuzaishinaigaowenxingnenghao，zhidongxiaoguowending，erqiebupanishuiqinxi，zaidongjiheelielukuangxiaxingche，panshizhidongbigushizhidonggengrongyizaijiaoduandeshijianneilingchetingxia。youxiepanshizhidongqidezhidongpanshanghaikailexuduoxiaokong
，jiasutongfengsanretigaozhidongxiaolv。fanguangushizhidongqi
，youyusanrexingnengcha，zaizhidongguochengzhonghui**大量的熱量。製動蹄片和輪鼓在高溫影響下較易發生極為複雜的變形，容易產生製動衰退和振抖現象

，引起製動效率下降。