汽车专业实用英语 教学课件 作者 陈晟闽 18-braking system.ppt

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1、WelcomeToBrakeSystemOperation&DiagnosisSECTION18ObjectivesListtheadvantagesofdiscbrakes.Listdiscbrakecomponentsanddescribetheirfunctions.Explainthedifferencesbetweenthethreetypesofcaliperscommonlyusedondiscbrakes.continued…ObjectivesDescribethetwotypesofparkingbrakesystemsusedwithdisc

2、brakes.Describethecausesofcommondiscbrakeproblems.Explainwhatprecautionsshouldbetakenwhenservicingdiscbrakesystems.continued…ObjectivesDescribethegeneralprocedureinvolvedinreplacingdiscbrakepads.Listanddescribefivetypicaldiscbrakerotorproblems.continued…DiscBrakeAdvantagesResistanceto

3、heatfadeResistancetowaterfadeIncreasedstraight-linestoppingabilityAutomaticadjustmentcontinued…DiscBrakeComponentsRotorIncludinghubonsomevehiclesCaliperassemblyIncludingpiston,seal,anddustbootPadsAntisquealhardwareAttachinghardwarecontinued…DesignsFixedcaliperThecaliperisboltedinafixe

4、dpositionanddoesnotmove.continued…DesignsFloatingcaliperThecalipermovesonlocatingpins.continued…DesignsSlidingcaliperSimilartothefloatingtype,butitdoesnotusepins.continued…CaliperSelf-AdjustmentAsthediscbrakepadswear,thesealallowsthepistontomovefartherouttoadjustautomaticallyforthewea

5、r,withoutallowingfluidtoleak.Sincethebrakepadsneedtoretractonlyslightlyaftertheyhavebeenapplied,thedeformationofthepistonssquare-cutsealretractsthepistononlyslightlyintoitsbore.continued…CaliperSelf-Adjustmentcontinued…CommonDiscBrakeProblemsPulsatingpedalCommonlycausedbywarpedrotorsS

6、pongypedalCommonlycausedbyairinthesystemHardpedalCommonlycausedbyapowerboosterproblemDraggingbrakesCommonlycausedbystickingorseizedpistonscontinued…CommonDiscBrakeProblemsGrabbingbrakesCommonlycausedbycontaminatedbrakeliningsNoiseCommonlycausedbyimproperpadinstallationPullingCommonlyc

7、ausedbyonewheeldoingmoreofthebrakingcontinued…Pre-ServiceChecksTires-forwearandimproperinflationWheels-forbentorwarpedrimsWheelbearings-forwearorloosenessSuspensioncomponents-forwearorloosenessBrakefluid-levelHydraulicsystem-forleakscontinued…BrakePadWearIndicatorsDiscPadWearSensorsSo

8、mebra