Automoble Brake System汽车制动系统The brkng system s the ost ioran sysein ars. f the baks fil, h eslt can e isastru. res re aculy energy cnvrsin evies, hiccoert th kinic enrg (momentum)ofth vehice ito hea energ （et）.hen stppngon th bakes， th drvercommnds stoppg focete imes as powefas the forc tapus the cr in mtion he bakin system ca eert housands f pouns o e o ech of the our aksTw comete indeenden braking systes are used on te car eyare seibakeandtheparkig brae.Te ervicebrae acts to lo,sop,or holthvhcle durig nrl drvn. They are fot-perate bythe rver depeing d releasnghe bra pedal. The primarypurpoe o the brak so hldthe vehicl staionary we i i unttd. The parkinbre is mehanical praedby when apaate pakinbrke fotdal o had levriset. Te br ystem impsed o te following aic comonents: th“mst ylindr” icis loated uner th hod,an is dirctly conncet the rke pedal，covtsdrve foot ecaialpresure ntohydrauc presure. Stel “brakelines” and flxile “bra ose” connec the maeylinder to th “slavcylindr” loctedt eachweel. Brakeluid, speiallydesigne to rk ntreme conditon, fils the sst“Shos” ad “ads” e uhed y tesavecyliders tcontct the“dums” nd “rotrs” us asing drg,whh (hopeull) sws theca.Thetypicalbrae sysemconsistso diskaes i ont ad either dsk r um bak in te rear onneted a sstem oftubes an hoss hat link thebrak t ah hel o th e cylider （Figue).asicay,all carbrakesae frctionbrakes. Wen the diver apples the bak,the control devce freae shes,orpads，agnt te otting baduor disks t heel Fcin betweenthe shosrds and th drumor disksthenlows ostos thewhee that thecar s braked.Inmo modern ake systems (ee ire 1)， thers a flui-l ylinder， ll mastecyinder,whchcaintwsarate sctis, thereis a iston in eacsectoand bt pistos re onnct t bak pel thrvrs ompartment.Whn h braes puhe dw, brakefluid is sen from hemastercylinde o te heels.Ate hes,heluipussoe,or pa, aaisreolvn drums or isksThefictobwehe taioryshoes, or ds, ndte rengumsor isks los d stopthem.Tisslows orsops te revolvg whels,ic, in urn, slwor stop th c Thebrakfluid esevr sontpof themaser cylinder. Mostcastdy ave trsent r reeroir sthat yan see teel without opeing the cver. The ra luidlevel will dropslighty as terake ad wer s is anomal onitioan o aue fo concr f the level drops nticeby over ashot erodfim or ges don to about to tirs full，have yo brkechecke as soon assible. Kepthe eservoiroveredexc fr he amount of time ynee t fill t and ner eavacam of brake luiucered. rae flidmt aintin a very hghboiligpont. Exposur to ir wi ause te fluo absor moistur which will lowe that oig point. The braeid taves fro he matercylnr to te wheels thrugh a serie of steel tube nd reinfoed ber hoesRe hes r nlyused n cs tht eqfebility, suchasathe ront weels, wh ove up a do s wel a eer The et o t syst ss n-orove mless steel tbing th ecialfitig at a attahent pois. I a eel le equirsrepair， te es proedure ito reac the ompee lie. If thsis not pracicl, a lne be repaid uinspecialice fttings thara r brakesystem epair You must neve se copper tubingo repara brak sstm. The are dagerousad ilegaDrum bra，it cossf therae dum,a expanr, pul bac sprigs, astationary bak lat， tw shoes with ftion lnings, an ancho pins.hetainaryclate is secre to e a ofhe axle housig r to the sering knukl. he bak drum is montedon he whee hb. Ther i a leaance twen thenner srfac te drum and the sholinng.To aply brak,tedive ushes pda， h xander xpands t shosad presses the to th drumFricton betwenhebrakeruand the fricion nings raes the wees andhe veiclestops o reeas as, the river leas he peal, hl backspringretat the shoes thu ermitting free rotation of he weels.Dsk bras, ithas a maldis istead fadrum.A lat e, or isk-braad， i lte on easie of the di The oes queze th rotatingisk to stopth caFuid rm the mae cylner rs the istos to move i, tward thd