drum brakes manual

7/29/2019 Drum Brakes Manual

1/7

RearDrumBrakeIndex/lnspection

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Never usean air hose or dly brush o clean brakeassemblies,Use an OSHAapprovedvacuum cleanar o avoid breathing brake dust,Contaminatedbrake inings or drums reducestopping ability.Block he tront wheels before ackingup ths rar of lhe vehicle.

Block he front wheels, oosen he rear wheel nuts slightly,support he rear of the vehicleon safetystands, henremove he rearwheels.2. Releasehe parking rake, nd remove he rearbrakedrum.

I N m 10.9 gtm, 6.5 bf.ftl

TENSIONPIN

10 mm BOLT6,1Nm 15.5 gf m,47 tbf.ft)

WHEELCYLINDERInspector eakage.lf necessary,eplace s an assembly.

u-cLrPReplace.WAVEWASHER

PARKINGBRAKELEVERMarked eftand r ight.

Check or weaknessan ooamage,UPPER ETURNSPRINGI@J PIVOTPIN

BACKING LATEMarkedel t an d ight-

/ f-lI I *'t")c tEv 'sB/ ( t

/ ,.ro,".r r.*,"n/ , Install ecurely n| /

tensionpin.d " /IU

ADJUSTER OI-TCheck atcheteethfor wearan ddamage. LOWERRETURNSPRINGCheckor weaknessan doamage.BRAKESHOEInspection,eepage19-36l f brake shoes are to bereused,mark and reassemblein same posi t ion.

SELF.ADJUSTERLEVEBSELF-ADJUSTERSPRINGCheckor weaknessan ooamage.

BRAKE RUMInspection,eepage 1936

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RearDrum BrakeInspection1 .

4 .

Check he wheelcylinder or leakage.Check he brake inings or cracking, lazing,wear,and contamination.Measurehe brake ining hickness.Brake Lining Thickness:Standard: 4.0mm {0.157n}ServiceLimit: 2.0 mm 10.08n)

NOTE;Measurement oes not includebrakeshoethickness.lf the brake ining hicknesss less han the servicelimit, eplacehe brake hoesas a set.Check he bearingsn th e hu b unit or smoothoper-ation. f defective, efer o section 18

WHEELCYLINDER

LININGS

19-36

6. Measure he inside diameter oJ the brake drumusing he nside ernier alipers.Drum Inside Diameter:Standard: 199.9 200.0mm {7.870 7.874 n)Servic imit: 201.0mm (7.913nl

l f t he ins ided iameter f the brakedrum is morethan he service imit, eplacehe brake rum.Check he brakedrum fo r scor ing , rooves, ndcracks.

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8.

INSIDEVERNIER ALIPERS

BRAKEORUM


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- BrakeShoeDisassembly1. Remove he tens ionp ins by push ing he re ta inersprings nd urning hem.

TENSION INS

RETAINERPRINGSLower the brake shoe assembly,an d remove helower eturnspring.NOTEiBe carefulnot to damage he dust coveronth ewheelcylinder.Remove he brake hoeassembly.Disconnecthe parkingbrake able rom the parkingbrake ever.Remove he upper eturnspring, elf-adjusterever,and se l f -ad jus te rpr ing ,and separa tehe brakesnoe5.

t3.4 .

ADJUSTEBBOLTCheck atcheteeth orwearan ooamage.UPPERRETURN PRINGCheckor weaknessanooamage .

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Nr//t

6. Remove he wave washer,parkingbrake ever,anpivot pin from the brakeshoe by removing he Uc l rp .

PARKINGERAKEI-EVERWAVEWASHER

/@ @IIU-CLIPReplace.

BrakeShoeReassembly1 . App ly brak e ylinder rease P/Nr 8733 B020E)equivalent ubbergrease o the sliding surfaceoth e pivot pin,an d nsert he pin nto he brake hoe

Install he parkingbrake everand wave washeroth e pivot pinand secure hem with he U-clip,NOTE: Pinch he U-clipsecurely o prevent he pivopi n rom comingout of the brake hoe.

,6;::"'

(cont'

19-3

LEVER


4/7

RearDrum BrakeBrakeShoeReassemblycont'dl

Connect he park ingbrakecab le o the park ingbrake ever.Applygrease n eachsliding urface.!@ contaminated brake linings reducestopping ability. Keepgreaseor oil off the blake lin-ings. Wipe any excessgreaseoff the parts,. Apply brake ylinder rease P/N: 8733 8020E)or equ iva len tubbergrease o the s l id ing ur -facesas shown.

+a Sliding urlace

ApplyMolykote 4MA o the brake hoeendsandopposite dges fthe shoes sshown.

_' o Opposite edge of the shoe+O Brake shoe ends

1 9 - 3 8

13.

5. Clean he hreaded ortions f clevises and B.Coat the threads of the cleviseswith grease.Toshoften the clevises, tun the adjuster bolt.6. Hook he self-adjuster pring to the self-adjusterlever irst, hen o the brake hoe7. Install he clevises nd upper returnspring.notingthe nstallation irection.

NOTE:Be carefulnot to damage he wheelcylinderdustcovers,8. Install he ower eturnspring.9. Install he ensionpinsand retaining prings.

uppERRETURT{pRtNG CLEVISCLEVISA

Installthebrake rum.lf the wheel cylinderha s been removed,bleed hebrake ystem se epage19-7), nd check or leaks tbrake ineconnections,nd retightenf necessary.Depress he brakepedal several imes to set theself-adjustingrake.Adjust he parking rake seepage19-6).

't0.1 1 .

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LOWERRETURN PRING


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BrakeHoses/LinesJ Inspection/Torquepecifications

t. Inspecthe brakehoses or damage, eterioration,eaks,nterference,nd wisting.2. Checkhe brake ines or damage, usting. nd eakage. lsocheck or bentbrake ines.3. Checkor ieaks t hoseand ine ointsand connections,nd retightenf necessary'4. Checkhe master ylinder ndABSmodulator nit or damage nd eakage

CAUTION:Replace ho brakehose clip whenevr he brake hose s serviced.

ABS MODULATORUNIT-Io-BRAKE-lNE19 N.m (1.9kgf.m, 14lbl.ftlPROPOBTIONINGONTROL ALVE.io-BRAKELINEl5 N.m 1. 5 11 bf.ftl MASTERCYLINDER-Io-BMKE INE15 N.m (1.5ksrf.m, 1 bf'ft)

REARDISGBRAKE:BRAKEHOSE-to4ALlPER{BANJOBOLT}34 N. m 3. 5 gtm,25 bf t lBLEEO CREW9 N'm (0.9kgf.m, 6.5 M.ftlBRAKE INE-to-WHEELYLIN15 N.m (1.5kgl.m,11 bf.ftlBLEED CREW7 N.m {0.7kst m, 5 lbf,ttl

J BRAKE INE-io-aRAKEOSE15 N. m 1. 5 11 btft)

BRAKE INE-Io-BRAKEOSE15 N.m (1.5kgt.m, 11 bf'ft)

(BANJOBOLT}3,1N.m 13.5 gf.m,25 bf.ft)

J

19-3


6/7

BrakeHoses/LinesHoseReplacementCAUTION:. Bgfore reagsembling,chgck hat all parts are free ofdust and othor foroign particles.. Repl8ceparts with new ones whenever specified o

do so,. Do not spill brake luid on th6 vehicle; t may damagetho paint; if brakefluid does contact the paint, washit off immediately with water.1 . Replacehe brakehose f the hose s twisted,cracked,or if it leaks.

Disconnecthe brakehose rom the brake ineusinga 10 mm flarenut wrench.FLARENUTWRENCHlCommerciallyava lable)BRAKE INE

BRAKEHOSERemoveand discard he brakehosecliD rom thebrakehose.

Remove he banjo bolt, and disconnect he brakehose rom the caliper.Remove he brakehosebracketro m the knuckle.

19-40

1 0 .

6. Install he brakehosebracket nd brakehoseontothe knuckleirst. hen connect he brakehose o thecaliperwith he banjoboltand newsealingwashers.

BRAKEHOSE

6 mm HOSEBRACKETBOLTS9. 8N. m{1.0 gf m, 7 lbtfr}

BANJO OI.T34N. m{3.5 gf.m,25bt.ftl7 . I ns ta l l he brakehoseonto he uooerbrakehosebracketwith a new brakehoseclip

15 N.m(1.sks{.m, 11 bl.ftl

Connecthe brake in e o the brakehose.After nstall inghe brakehose,bleed he brakesys-te m (seepage19-7).Perform he ollowing hecks:. Check he brakehoseand ine oint or leaks, ndtighten f necessary.. Check he brakehoses or interferencend wist-

Ing .

8.


7/7

ParkingBrakeCableInspectionndReplacementCAUTION:The parking blake cables must not be bent or distorted. This will lead to stiff operation and prematurecablefailure.

PARKING RAKECABLECheckor faultymovement.PARKINGBRAKELEVERCheckor smoothoperation.

,

EOUALIZER

PARKING RAKESWITCH

Disc BrakeType:Disconnecthe parking rake able ro m the leveron th ecaliperby removing he lockpin and clevispin,and removeth ecablerom hear mby removingheclip

CLEVISPIN

Drum BrakeType:Remove he parkingbrakecable rom the backingplatusinga 12mm offsetwrenchasshown.

12mmOFFSETWRENCH(Commerciallyvailable)

DISCBRAKETYPE:CLEVISPIN

PARKINGERAKECABLE

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BACKING LATE

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drum brakes manual

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