Mercedes-Benz 300 SE 1993 Owner's Manual page 91

A cceleration Slip C ontrol (ASR )
The acceleration slip control will
engage at all vehicle speeds, if
one or both drive w heels begin to
lose traction and spin due to
excessive acceleration. W hile
engaged, the yellow function in d i­
cator in the speedom eter lights up
W ith the acceleration slip control
engaged, the brake is applied to
the spinning drive wheel until it
regains sufficient traction. If both
drive w heels lose traction and
spin, the brake is applied to both
drive w heels and sim ultaneously,
engine torque is lim ited.
As traction on the road surface
increases, the allow able engine
torque also increases again and
the brake is no longer applied to
drive wheels.
Caution!
If the ve hicle is towed w ith the
front axle raised (see Tow ing the
ve hicle in Index), the key m ust not
be in steering lock position 2.
O therw ise, the acceleration slip
control w ill im m ediately be en­
gaged and w ill a pply the rear
w heel brakes.
Notes:
W ith the key in steering lock posi­
tion 2, the yellow function indicator
lam p and the yellow ASR w arning
lam p in the instru m e nt cluster
com e on. They m ust go out when
the engine is running.
If the ASR w arning lam p com es
on w ith the engine running, a
m alfunction has been detected.
Pressing the a ccelerator pedal will
require greater effort. O nly partial
engine output is available.
Have the acceleration slip control
checked at your authorized
M ercedes-B enz dealer as soon as
possible.
D riving the vehicle with varied size
tires w ill cause the w heels to ro­
tate at different speeds, therefore
the acceleration slip control will
activate (yellow ASR function
indicator lam p in instrum ent c lu s­
ter com es on). For this reason, all
w heels, including the spare wheel,
m ust have the sam e tire size.
W hen testing the parking brake on
a brake test dynam om eter, the key
m ust not be in steering lock posi­
tion 2. O therw ise, the acceleration
slip control w ill im m ediately be
engaged and w ill apply the rear
wheel brakes.
In w inter operation, the m axim um
effectiveness of the acceleration
slip control is only achieved with
M ercedes-B enz recom m ended
M + S radial-ply tires.
On vehicles equipped with a ccel­
eration slip control, the brake pad
w ear w arning lam p indicates brake
pad w ear for the front as well as
the rear brakes.