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owners manual BMW 3 E21
owners manual BMW 3 E21 - year of production: 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983 - BMW 3 E21 316 318i 320 323i owners manual EN
Document: pdf (8.6 MB) 149 pages
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text version of content this owner's manual page from owners manual to the vehicle BMW 3 E21, year of production 1975 - 1983:
'/
56 DIscbrakes
Usefulinformationon discbrakes Wetconditions,dirt,saltspreadon winter All theseclimaticand environmental
The brakeboosterservoon yourBMW roadsandcorrosionofthebrakediscscan effectscausea changein thebrakes'
operatespneumatically,so thatthe nec- impairbrakebehaviorbyincreasingbrak- coefficientof friction.i. e. less braking
essaryvacuumis builtup onlywhenthe ing distances,alteringthe car'snormal efficiencyis availablefor a given pedal
engineis running.Whenthecaris moved brakepressuredistribution,causingvaria- effort.Ifthe coefficientsoffrictionchange
withtheenginestoppedandthepressure tionsin the coefficientof frictionon the in this way the brakes may respond
• reservoirempty,forinstancewhenbeing individualwheelsand thusmakethe car unevenlyor pullto one side.
towed,a muchhigherpedalpressurethan pullto one side.
usual will be needed to producethe Corrosion
anticipatedbrakingeffect. ofthebrakediscsis accelerated
if the caris usedverylittleorgaragedfor
On long downhillgradientsthe engine's long periods.
brakingactionwhenthethrottleis closed Gentle
can be increasedby selectinga lower ormoderateuseofthebrakesalso
gear. Neverrun downhillwiththe clutch promotescorrosionofthebrakediscsand
pedaldepressed,thegearleverin neutral allowsthe brake pads to becomedirty
or - a very dangerouspractice- the becausetheminimumpressurenecessary
ignition forthediscbrake'sself-cleaningactionis •
switchedoff. notreachedbetweenthepad and disc. .
It is essentialto observethe runningin Corrodedbrakediscscause a knocking
instructionsforthebrakingsystemwhen effectwhenthe brakesare appliedand
newbrakepads are fitted- see 'OPERA- this cannotgenerallybe eliminatedby
TINGINSTRUCTIONS'. prolongedbraking.
Warning:When renewingbrake pads, Dirtburntintothe brakepads(glazingof
only BMW-approvedbrakepads should brake area) and cloggeddraingrooves
be used otherwisethe GeneralOperating causescoringofthebrakediscsas wellas
Permitor equivalentmaybe invalidated. a change,reductionor delayin braking
A disc brake systemoffersoptimum effect.
brakingefficiency,smoothresponseand a Anotherproblemin this connectionis
high loadcapacity.The peaktemperatu- brake squealwhichtendsto increasein
res whichoccurduringbrakeapplications,
e. g.on mountainpasses when driving intensityas the discsbecomedirtieror
quickly,necessitatea maximumdegreeof glazed.
coolingwhichis providedexclusivelyby
ram air or the peripheralspeed of the
• brakediscs.
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year of production from: 1975
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BMW 3 E21 316 318i 320 323i owners manual
pages 50 - 56
pages 50 - 56
BMW 3 E21 316 318i 320 323i owners manual
page 53 / 149
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