An tilo c k Bra ke S ys te m (ABS )
129n
Th e c o n c e p t
Bra kin g w ith ABS
On ro a d s urfa c e s th a t h a ve a lo os e
s urfa c e la ye r o n a firm b a s e w ith g ood
tra c tio n (o n g ra ve l o r s now, fo r in -
s ta nc e ), b ra kin g d is ta nc e s m a y b e
longe r th a n w ith lo c ke d w he e ls . Th is is
a ls o tru e if s now c ha ins a re m ounte d .
Ho we ve r, AB S c ontin 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 .
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 c ome 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.
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 ro ps
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 th at re quire s full
bra king, yo u w ill exp loit th e full be ne fits
of th e ABS s ys te m if you apply maxim um
bra ke p re s s ure ("p anic s to p"). S ince 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 o bs ta cle s
with a m inimum o f s te e ring e ffort, d e -
s pite th e full bra ke a pplic atio n.
The AB S s ys te m 's c los e d -loop c ontro l
c irc uit c yc le s in fra c tio ns o f a s e c ond .
A p uls a tio n a t th e b ra ke p e d a l, to ge th e r
with th e s ound s a s s oc ia te d w ith th e
hyd ra ulic c ontro ls , te lls yo u th a t th e
b ra ke s ys te m is w ith in its m a xim um
lim it ra nge a nd re m ind s yo u th a t yo u
s hould a d a p t ro a d s p e e d to th e ro a d
c ond itio ns .
With ABS , yo u w ill a c hie ve th e s horte s t-
p os s ib le b ra kin g d is ta nc e s u nd e r a ll
give n c ond itio ns (b ra kin g w hile d rivin g
s tra ight a he a d o r in c urve s , d iffe re nt
ro a d s urfa c e s ).
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:
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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 ).
Online Edition for Part No. 01 41 0 004 597 - © 08/99 BMW Group
| Categories | BMW 7-Series Manuals, BMW Manuals |
|---|---|
| Tags | BMW 740i, BMW 740iL, BMW 750iL, BMW E38 |
| Model Year | 2001 |
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| Document File Type | |
| Copyright | Attribution Non-commercial |
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