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1、RoutinebrakesystemmaintenanceThebrakingsystemisthemostimportantsystemonacar.Ifthebrakesdon'tworkproperly,theresultcanbedisastrous.Sothegoodbrakesareessentialforsafety.Therearetwocompletelyindependentbrakingsystemsonacar.Oneistheservicebrake,andtheotherisparkingbrake.Theservicebrakeactstoslow,sto
2、p,orholdthevehicleduringnormaldriving.Theyarefoot-operatedbythedriverdepressingandreleasingthebrakepedal.Theparkingbrake'spurposesaretoholdacarstationarywhileitisunattended,andtokeepthecarfromrollingonunleveledground.Itisalsocalledthehandbrake.Basically,allcarbrakesarefrictionbrakes.Whenthedrive
3、rappliesthebrake,thecontroldevicewillforcebrakeshoesorpadsagainsttherotatingbrakedrumsordiscsatwheels.Frictionbetweentheshoesorpadsandthedrumsordisksthenslowsorstopsthewheelssothatthecarisbraked.DiscbrakeDiscbrakesareusedonthefrontwheelsofmostcarsandonallfourwheelsonmanycars.Themaincomponentsofa
4、discbrakearethebrakepads,thecaliperwhichcontainsapiston,andtherotorwhichismountedtothehub.Thediscbrakeisalotlikethebrakesonabicycle.Bicyclebrakeshaveacaliper,whichsqueezesthebrakepadsagainstthewheel.Inadiscbrake,thebrakepadssqueezetherotorinsteadofthewheel,andtheforceistransmittedhydraulicallyin
5、steadofthroughacable.Frictionbetweenthepadsandthediscslowsthediscdown.Amovingcarhasacertainamountofkineticenergy,andthebrakeshavetoremovethisenergyfromthecarinordertostopit.Thebrakesconvertthekineticenergytoheatgeneratedbythefrictionbetweenthepadsandthedisc,sothecarstops.DrumbrakeSoifdiskbrakesa
6、resogreat,howcomewestillhavecarswithdrumbrakes?Thereasoniscost.Whileallmostvehiclesformanyyearshavediskbrakesonthefrontwheels,drumbrakesarecheapertoproducefortherearwheels.DrumbrakeisshowninFig.Drumbrakesconsistofabackingplate,brakeshoes,brakedrum,wheelcylinder,returnspringsandanautomaticorself-
7、adjustingsystem.Whenyouapplythebrakes,thewheelcylinderpushesthebrakeshoesintocontactwiththemachinedsurfaceontheinsideofthedrum.Whenthepressureisreleased,returnspringspulltheshoesbacktotheirrestposition.Asthebrakeliningswear,
