An tilo c k Bra ke S ys te m (ABS )
125n
Th e c o n c e p t
Bra kin g w ith ABS
In d rivin g c ond itio ns w he re th e re is a
loos e u p p e r s urfa c e to ge th e r w ith a
ABS e nha nc e s a c tive s a fe ty b y h e lp ing The s ys te m b e come s o pe ra tive o nce
to p re ve nt th e w he e ls fro m lo c kin g d ur- th e ve hicle e xc e e ds a s pe e d o f a pprox.
s ub s urfa c e w hic h p ro vid e s b e tte r tra c -
tio n (on g ra ve l o r s now, fo r in s ta nc e ), o r
with s now c ha ins , th e b ra kin g d is ta nc e
m a y a ls o b e lo nge r th a n w he n th e
whe e ls a re lo c ke d . Ho we ve r, AB S c on-
tin ue s to p ro vid e e nha nc e d ve hic le s ta -
b ility a nd s te e ring re s p ons e u nd e r
th e s e c ond itio ns .
ing b ra ke a p p lic a tio ns . Th e re a s on:
Loc ke d w he e ls a re d a nge ro us . Wh e n
th e fro nt w he e ls s lid e , th e d rive r lo s e s
s te e ring c ontro l o ve r th e ve hic le . Tra c -
tio n lo s s a t th e re a r w he e ls c a n c a us e
th e re a r e nd to b re a k in to a n u nc on-
tro lle d s kid .
6 m ph (10 km /h). The ABS is d e activa te d
whe neve r th e ve hicle 's s pe e d d rops
back b e low a pprox. 4 m ph (6 km /h). This
me ans th at th e w he e ls c an lo ck in th e fi-
nal pha s e o f a p anic s to p – a fa cto r of no
s ignificance in a ctu al us e.
If you a re in a s ituatio n w hich re quire s
full bra king, yo u w ill exp loit th e full be ne -
fits o f th e ABS s ys te m if yo u a pply m axi-
mum b ra ke p re s s ure ("p anic s to p").
Since th e ve hicle m ainta ins s te e ring re -
s pons ive ne s s, yo u c an a void p os s ible
The s ys te m c a n a c hie ve th e s horte s t
b ra kin g d is ta nc e s p os s ib le u nd e r m os t
c ond itio ns (o n s tra ights a nd in c urve s ,
on a s p ha lt, ic e , w e t ro a d s urfa c e s , e tc .).
In fo rm a tio n fo r yo u r s a fe ty
No t e ve n AB S c a n s us p e nd th e la ws o f
p hys ic s . AB S a lone c a nnot p re ve nt a c -
c id e nts w he n th e b ra ke s a re a p p lie d
ABS is d e s igne d to m e e t tw o e s s e ntia l
re q uire m e nts d uring e ve ry b ra ke a p p li-
c a tio n:
obs ta cle s w ith a m inimum o f s te e ring e f- with out a n a d e q ua te s a fe ty in te rva l b e -
fort, d e s pite th e full bra ke a pplicatio n.
The ABS s ys te m c los e d-loop c ontro l c ir-
cuit c yc le s in fra ctio ns o f a s e cond.
A p uls atio n a t th e b ra ke p e dal indicate s
to th e d rive r th at ABS is a ctive , th at is ,
th at th e ve hicle is w ithin its m axim um
bra king ra nge. In a ddition, a p uls atio n – a
re s ult o f th e c ontro l functio n c yc le s – in -
dicate s to th e d rive r th at ve hicle s pe e d
s hould b e re duce d to a dapt to ro ad s ur-
face c onditions w he n th e re is re duce d
tra ctio n a nd g rip b e twe e n tire s a nd ro ad
s urfa ce (s lippe ry ro ad s urfa ce ).
tw e e n ve hic le s , if th e c a r is d rive n a t a n
e xc e s s ive ra te o f s p e e d in c urve s , o r if
a q ua p la ning o c c urs . R e s p ons ib ility fo r
th e s e typ e s o f s itu a tio ns re m a ins in th e
ha nd s (a nd a t th e fe e t) o f th e d rive r. Yo u
s hould n e ve r a llow th e a d d e d s a fe ty o f
ABS to lu ll yo u in to a fa ls e s e ns e o f s e -
c urity, o r m is le a d yo u in to ta kin g in -
c re a s e d ris ks th a t c ould a ffe c t yo ur o wn
s a fe ty a nd th a t o f o th e rs .
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To h e lp p ro vid e ve hic le s ta b ility
To h e lp m a inta in s te e ring c ontro l a nd
m a ne uve ra b ility – o n a ll typ e s o f ro a d
s urfa c e s (a s p ha lt, c onc re te , m ud , w e t
p a ve m e nt, s now, ic e ).
Do n ot m a ke a ny m od ific a tio ns to
th e AB S s ys te m .
S e rvic e p ro c e d ure s o n AB S a re to b e
p e rfo rm e d b y a uth orize d te c hnic ia ns
only.<
Always d e pre s s th e b ra ke p e dal with
cons ta nt p re s s ure. Ke e p th e b ra ke p e dal
down. Do n ot p ump th e b ra ke s.
Online Edition for Part-No. 01 41 9 791 187 - © 12/98 BMW AG
| Categories | BMW 7-Series Manuals, BMW Manuals |
|---|---|
| Document Type | Free Auto PDF Owners Manual Download |
| Tags | BMW 740i, BMW 740iL, BMW 750iL, BMW E38 |
| Model Year | 1999 |
| Download File |
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| Document File Type | |
| Publisher | bmwusa.com |
| Wikipedia's Page | BMW 7-Series (E38) |
| Copyright | Attribution Non-commercial |
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