2003 BMW MOTORRAD R 850 R brakes

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Brake system – general
Oil and grease on brakes
d Warning:
Brake discs and pads must be
free from oil or grease.
Dirt or mud on brakesWhen riding on loose surfaces
or muddy roads, the brakes
may fail to take effect immedi-
ately because of dirt or mois-
ture on the discs or brake pads.
d Warning:
The brakes must first be
applied until the discs and
pads are clean.
Dirt on the brakes increases
the rate of pad wear.
d Warning:
If the brake lever can be moved
right to the limit of its travel, this
indicates a mechanical or hy-
draulic fault. The brake system is
defective.
Immediately consult a specialist
workshop, preferably an author-
ised BMW motorcycle dealer.
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Brake system - with BMW Integral ABS2(
Sensitive electronic
control
It takes skill and sensitive con-
trol of the brakes to pull up
safely on a motorcycle. If the
front wheel brake locks and the
wheel skids, the necessary lon-
gitudinal and lateral stabilising
forces are lost, and a fall can
result.
For this reason, the rider sel-
dom makes full use of available
braking performance in an
emergency.
2(Optional extra
BMW Integral ABS is the latest-
generation BMW ABS develop-
ment: by preventing both
wheels from locking and opti-
mising braking-force distribu-
tion by means of the integral
function, it offers much
improved braking performance
(
b 70). Full use is made of tech-
nical braking capacity to mini-
mise braking distances, even
when road conditions are poor.
When the motorcycle is ridden
in a straight line, the BMW Inte-
gral ABS is able to handle
emergency braking safely.
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Brake system - with BMW Integral ABS2(
Extra safety reservesBut remember: the potentially
shorter braking distances
which BMW Integral ABS per-
mits must not be used as an
excuse for careless riding. ABS
is primarily a means of ensuring
a safety margin in genuine
emergencies.
–You have to familiarise your-
self with the new, electroni-
cally assisted braking. Try the
brakes several times when
you take your motorcycle out
for the first time. Find out for
yourself how the brakes feel
– Never ride without due care
and attention, or assume that
good fortune will protect you
from your own foolhardiness
– Keep within the permitted
speed limits –
Take care when cornering.
When you apply the brakes on
a corner, the motorcycle's
weight and momentum take
over and even BMW Integral
ABS is unable to counteract
their effects.
2(Optional extra
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Brake system - with BMW Integral ABS2(
Partially integral brakesThe integral brake function
interlinks the front and rear
brakes, so both wheels are
braked when you operate the
brake lever.
The electronic controller in the
BMW Integral ABS computes
the braking-force distribution
between front and rear wheels,
and applies the brakes
accordingly.
Braking-force distribution
depends on load and is recal-
culated every time the ABS
controller comes into action.
In this partially integral brake
configuration the integral brak-
ing function is activated only
when you pull the handbrake
lever. The footbrake lever acts
only on the rear brake.Brake servoThe hydraulic pump in the BMW
Integral ABS actively boosts the
braking force acting on the
wheel when the brakes are
applied.
By boosting the braking force in
this way, BMW Integral ABS
achieves higher braking effi-
ciency than conventional brake
systems.
ABS - anti-lock brake
system
ABS prevents the wheels lock-
ing under heavy braking when
the motorcycle is travelling in a
straight line, thus contributing
significantly to road safety.
2(Optional extra
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Brake system - with BMW Integral ABS2(
RESIDUAL BRAKING
FUNCTION
If the BMW Integral ABS devel-
ops a fault, a RESIDUAL BRAK-
ING FUNCTION only is available
in the brake circuits in question.
The RESIDUAL BRAKING
FUNCTION is the braking effi-
ciency without the hydraulic
servo assistance of the BMW
Integral ABS.
Under these circumstances,
therefore, you must apply CON-
SIDERABLY higher pressure to
the brake levers in question in
order to apply the brakes, and
lever travel is longer.
When the RESIDUAL BRAKING
FUNCTION is active, the ABS
function is unavailable in the
brake system in question.
When the RESIDUAL BRAKING
FUNCTION is active, the inte-
gral braking function is partially
or entirely unavailable.
d Warning:
When the RESIDUAL BRAK-
ING FUNCTION is active,
maintain a defensive riding
style and proceed immediate-
ly to the nearest specialist
workshop, preferably an au-
\f Note:
When the RESIDUAL BRAKING
FUNCTION is active at the front
wheel, it is advisable to set ad-
juster A of the front-brake lever
to position 4 (
b 27).
The RESIDUAL BRAKING
FUNCTION is active under the
following circumstances:
– Ignition off
– Before and during self-diag-
nosis (
b 72)
– Fault in the BMW
Integral ABS (
b 75)
\f Note:
When the RESIDUAL BRAKING
FUNCTION is active for both
brake circuits, the noise of the
pump is no longer audible when
you operate the brake levers.
2(Optional extra
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Start the engine.
 Move off
– ABS warning light 2:
OFF (as of approx. 5 km/h
road speed)
bPull-away test successfully
completed
bBMW Integral ABS is
available
\f Note:
Starting on gradients:
Always switch on the ignition
with gear engaged, clutch lever
released and both brake levers
released.
Self-diagnosis cannot be per-
formed if you do not follow this
procedure.
When self-diagnosis com-
pletes, apply the brakes, disen-
gage the clutch, and start the
engine.
\f Note:
Flashing at 1 Hz = 1 flash per
second (slow flashing)
Flashing at 4 Hz = 4 flashes per
second (fast flashing)
2(Optional extra
12
Brake system - with BMW Integral ABS
2(
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d Warning:
If the BMW Integral ABS fails
in both brake circuits, a
RESIDUAL BRAKING FUNC-
TION only is available. (b 71)
d Warning:
If the RESIDUAL BRAKING
FUNCTION (
b 71) is active,
maintain a defensive riding
style and proceed immediate-
ly to a specialist workshop,
preferably an authorised
BMW motorcycle dealer.
2(Optional extra
d Warning:
If there is a fault in the ABS
system, the reserves of safety
normally afforded by ABS are
not available until the defect
has been put right.
There is a risk of dropping the
motorcycle if the brakes are
applied too hard and the
w h ee ls l o ck o r th e r e ar w h ee l
lifts clear of the ground as a
result of a high level of tyre
adhesion. Have the defect
rectified immediately by a
specialist workshop, prefera-
bly an authorised
BMW motorcycle dealer.
Brake system - with BMW Integral ABS2(
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2(Optional extra
Warning light,
generaleABS warning
light
\b Malfunctions
OFF ON Only RESIDUAL BRAKING FUNCTION available in both circuits (
b 71)
OFF Flashing at 1 HzABS not available
Pull-away test not completed (
b 72)
OFF Flashing at 4 HzOnly RESIDUAL BRAKING FUNCTION
available in both circuits (
b 71)
Self-diagnosis not completed (b 72)
ON OFF Rear light/brake light defective (b Maintenance Instructions, Chapter 2)
ON Flashing at 1 HzAt least one brake circuit without
ABS (
b 70)
ON Flashing at 4 HzAt least one brake circuit in RESIDUAL
BRAKING FUNCTION mode (
b 71)
Alternate
flashing at
1 Hz Alternate
flashing at
1 HzFluid level in BMW Integral ABS too low.
Check the motorcycle as follows:
Ignition OFF: is brake pressure OK at the
brake levers?
Are the brakes acting on both wheels?
Is the brake system leaktight, no signs of
brake fluid escaping?
The brake system is defective if the test
outcome is negative.
Alternate
flashing at
4 Hz Alternate
flashing at
4 HzFluid level in the BMW Integral ABS is too
low, perform the checks listed above.
Only RESIDUAL BRAKING FUNCTION
available in at least one circuit (
b 71)
d Warning:Do not ride the motorcycle if you have
any doubts about the dependability of
the brake system.
BMW Integral ABS2( - Troubleshooting chart
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