12 2 n
Antilock Brake System (ABS)
The concept
A B S e n h a n c e s a c tiv e s a f e ty b y h elpin g
to pre v e nt th e w h e els fro m lo c king
un d er bra kin g. T his is b e c a us e lo c k e d
w h e els are d an g ero us. W h e n th e fro nt
w h e els slid e, th e driv er lo s e s ste erin g
c o ntrol ov e r th e v e hi cle. Tra ctio n lo ss at
th e re ar w h e els c a n c a u s e th e re ar e n d
to bre a k into a n un c o ntrolle d ski d .
Th e sy ste m c a n a c hie v e th e sh orte st
bra kin g d ista n c es p ossibl e u n d er m ost
c o n ditio ns (o n straig ht- a w a ys a n d in
c urv e s, o n a s p h alt, ic e , w et ro a d
surf a c es, etc. ).
A B S is d e sig n e d to m e et tw o e ss e ntial
re q uire m e nts d urin g e v ery bra k e a p pli-
c atio n:
> To h e l p provid e v e hicle sta bility.
> To h el p m aintain ste ering c o ntrol a n d
m a n e uv era bility – on all ty p e s of ro a d
surf a c es (a s p h alt, c o n crete , m u d, w et
ro a d surf a c e s , s no w, ic e).
Braking with ABS
At a b o ut 6 m p h (1 0 k m /h), th e syst e m
b e c o m e s o p e rativ e . W h e n e v er th e
v e hicle's s p e e d dro p s b e lo w a p p rox.
4 m p h (6 k m /h) , th e A B S is d e a ctiv ate d.
This m e ans th a t th e w h e els c a n lo c k in
th e fin al p h a s e of a p a ni c sto p – a fa c tor
of n o sig nific an c e in a ctu al us e.
If yo u are in a situ a tio n th at re q uire s full
bra kin g, y o u will e x ploit th e f ull b e n e fits
of th e A B S syst e m if y o u a p ply m a xi-
m u m bra k e pre ssure (" p a nic sto p ").
Sin c e th e v e hicle m aint ain s st e erin g
re s p o nsiv e n e s s, yo u c a n n e v erth ele ss
av oid p o s si ble o b sta cle s with a
minim u m of st e e rin g e ffort.
Th e A B S syst e m clo s e d -lo o p c o ntrol
circ uit c ycle s in fra ctio n s of a s e c o n d.
A p uls atio n a t th e bra k e p e d al, to g e th er
with th e so un d s a s s o ciat e d w ith th e
hydra ulic c o ntrols, tells y o u th at th e
bra k e syst e m is within its m axim u m
limit ra n g e a n d r e min d s y o u th at yo u
sh o uld a d a pt ro a d s p e e d to th e ro a d
c o n ditio ns.
O n ro a d surf a c es th a t h a v e a lo os e
surf a c e la y er o n a firm b a s e w ith g o o d
tra ctio n (on grav el or sn o w , f or
e x a m ple), or w h e n sn o w c h ains are
m o u nte d, bra kin g dista n c es m ay b e
lo n g er th a n w ith lo c k e d w h e els.
N ev erth ele s s, A B S p oss e s s e s th e
a d v a nta g e of v e hicle sta bility a n d
ste erin g re s p o n s e .
Information for your safety
N ot e v e n A B S c an sus p e n d th e la w s of
p h y si c s. A B S c a nn o t pre v e nt th e
c o n s e q u e n c es of b ra k e a p plic atio ns
with in a d e q u a t e cl e ara n c e s f or s af e ty
b e t w e e n v e hicle s, w h e n e x c e e din g th e
s p e e d limit, or th e risks involv e d w h e n
a q u a pla nin g o c c urs. R e s p o nsibility f or
th e s e ty p e s of situ atio ns re m ain s in th e
h a n d s (a n d at th e f e e t) of th e driv er. Y o u
sh o uld n e v er allo w th e a d d e d s af e ty of
A B S to lull yo u into a f als e s e ns e of
s e c urity, or misl e a d y o u into ta kin g
in cre a s e d risks.
D o n ot m ak e a ny m o dific atio ns to
th e A B S syst e m.
S ervic e pro c e d ure s o n A B S ar e to b e
p erf orm e d b y a uth oriz e d te c hni cia n s
only. <
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