BMW AG Motorcycle (R 850 C, R 1200 C). Manual - part 24

34.11

Removing and installing front ABS 
sensor

•

Remove fuel tank.

•

Separate plug connector (1) in sensor line.

•

Remove sensor (2) with Torx T 25.

•

Install by following the above work instructions in 
the reverse order.

e

 Caution:

Run the sensor line correctly.
Check sensor gap and adjust if necessary with 
spacer plate (3).

Sensor gap:............ 0.45...0.55 mm (1.77...2.22 in)

X 

Tightening torque:

Sensor  ..........................................handtight, 4 Nm

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34.12

Adjusting front ABS sensor gap

Marking sensor wheel

•

Take load off front wheel/lift clear of ground.

•

Attach dial gauge holder (1), BMW No. 00 2 500, 
with dial gauge, BMW No. 00 2 510, and meas-
uring shoe (2), BMW No. 34 2 510, to the fork 
slider tube.

•

Zero the dial gauge.

•

Measure axial runout over the entire circumfer-
ence.

•

Using a paint pencil, make a permanent mark at 
the point where the sensor is farthest away from 
the sensor wheel (arrow).

Checking and adjusting sensor gap

•

Check/adjust at the marked point.

•

If necessary, remove/install sensor with 
Torx T 25 and adjust sensor gap with spacing 
plates.

Sensor gap:............ 0.45...0.55 mm (1.77...2.22 in)

e

 Caution:

After adjusting, check that the sensor can move 
freely for a complete turn of the wheel.

00 2 500

C340060

00 2 510

34 2 510

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34.13

Removing and installing rear ABS 
sensor

L

 Note:

To install spacing shims, pull the sensor out by a 
small amount only and pull the spacing shims out 
upwards.

•

Before removing/installing, clean the sensor 
bore.

•

Using Torx T 25, detach sensor (1).

•

Separate plug connector (2) in the sensor line.

•

Install by following the above work instructions in 
the reverse order.

•

Coat O-rings with oil before installing.

e

 Caution:

Run the sensor line correctly.
Check sensor gap and adjust if necessary with 
spacer plates (3).

Sensor gap:............ 0.45...0.55 mm (1.77...2.22 in)

X 

Tightening torque:

Sensor ...........................................handtight, 4 Nm

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34.14

Adjusting rear ABS sensor gap

Marking sensor wheel

•

Before removing/installing, clean the sensor 
bore.

•

Using Torx T 25, detach the sensor.

•

Screw dial gauge holder with measuring shoe 
and extension, BMW No. 34 2 520, with dial 
gauge, BMW No. 00 2 510, firmly to the sensor 
mount.

•

Zero the dial gauge.

•

Measure axial runout over the entire circumfer-
ence.

•

Make a permanent paint pencil mark at the point 
where the sensor wheel is farthest away from the 
sensor (arrow).

e

 Caution:

If parts are replaced (brake disc etc.) and a used or 
previously marked sensor wheel is installed, the 
sensor ring must be measured and marked again.
Remove the old marking.

Checking and adjusting sensor gap

•

Check/adjust at the marked point.

•

If necessary, remove/install sensor with
Torx T 25 and adjust sensor gap with spacing 
plates.

e

 Caution:

After adjusting, check that the sensor wheel is free 
to turn at all points on its circumference.

Sensor gap:............ 0.45...0.55 mm (1.77...2.22 in)

X 

Tightening torque:

Sensor ...........................................handtight, 4 Nm

34 2 520

C340040

00 2 510

34.15

Removing and installing rear brake 
master cylinder

•

Drain fluid from brake system.

e

 Caution:

Do not allow brake fluid to come into contact with 
painted parts of the motorcycle, because brake fluid 
destroys paint.

•

Detach the brake line and hose.

•

Slacken off the pin at the linkage.

•

Detach brake master cylinder.

•

Install by following the above work instructions in 
the reverse order.

•

Attach non-reusable hose clip with pliers, 
BMW No. 13 1 500.

e

 Caution:

Bleed the brake system carefully.
Check/adjust piston rod snifting-action play.

X 

Tightening torque:

Master cylinder to footrest plate ..................... 9 Nm

Checking and adjusting relief
clearance of piston rod

•

Insert a feeler gauge of the correct thickness be-
tween the adjusting screw/brake lever and the 
stop (arrow).

Feeler gauge thickness: ............ 0.2 mm (0.008 in)

•

Release locknut (1).

•

Insert piston rod (2), turning to right until clear-
ance is present.

•

Turn the piston rod carefully to the left to with-
draw it again until no clearance is present; lock it 
in this position.

•

Tighten locknut/check clearance again.

Removing and installing brake pedal

•

Lubricate pivot bushing with Shell Retinax A.

e

 Caution:

Check/adjust piston rod relief clearance.
See removal and installation of brake master cylin-
der.
The brake light must come on as soon as the rear 
brake begins to take effect.

X 

Tightening torque:

Brake pedal to footrest plate
(thread free from grease) .............................. 37 Nm

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34.16

Removing and installing ABS unit

e

 Caution:

Work on the ABS unit is only to be performed by an 
authorized BMW workshop.

Removing the ABS unit

•

Remove fuel tank.

•

Disconnect ABS brake lines (1) at ABS unit.

e

 Caution:

If brake fluid escapes, it may damage paint.
Line connections must be protected against dirt 
penetration; if ncessary seal/cover over.

•

Hold the front brake lever against the handlebar 
grip with a rubber band (to close the brake fluid 
feed bore).

e

 Caution:

Switch off ignition, disconnect and insulate the 
ground (earth) strap.

•

Remove cover (2) from ABS control unit, press 
the lock in with a screwdriver and pull the cover 
up.

•

Detach wires (3). 

•

Pull off 2-pin plug (4).

•

Pull off the central plug (5).

•

Remove the ABS unit (6).

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5

6

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34.17

Installing the ABS unit

•

Install the ABS unit (6).

•

Connect the central plug (5).

e

 Caution:

Make sure the cable is not at an angle, or its insula-
tion may be damaged.

•

Reconnect the 2-pin plug in the correct position, 
pushing the two halves fully together, and press 
the two wires into the center (smaller) cable en-
tries.

•

Push the two plugs for the connecting cable/wir-
ing harness onto the threaded pins with the 
crimp at the front.

•

Press the two cables into the remaining free ca-
ble entries. 

•

Tighten the nuts.

e

 Caution:

Always use new self-locking nuts.

X 

Tightening torque:

Battery —/M5 ............................................... 3.5 Nm
Battery +/M4 .................................................. 3 Nm

•

Install a new cover.

e

 Caution:

When sliding the cover on, make sure that all cables 
are correctly located in their cable entries. Scrap 
the old cover.

•

Screw ABS brake lines (1) to ABS unit.

•

Fill/bleed the brake system.

•

Install the fuel tank.

X 

Tightening torque:

ABS unit to holder
M6 screw ......................................................  9 Nm
M6 screw (Torx).............................................. 5 Nm
Brake line to ABS unit .................................. 14 Nm
Bleed screw at ABS unit................................. 9 Nm

34.18

Removing and installing ABS relay 
and relay base

Removing ABS relay

e

 Caution:

Switch off ignition, disconnect and insulate the 
ground (earth) strap.

•

Remove cover (1) from ABS control unit, press in 
the lock with a screwdriver and pull the cover up.

•

Scrap the old cover (1).

•

Detach lines (2) and discard nuts.

e

 Caution:

Make sure the cable is not at an angle, or its insula-
tion may be damaged.

•

Pull off 2-pin plug (3).

•

Take out relay base (4).

•

Slacken off screws on relay base by app. 2 turns 
with Torx T20.

•

Pull the relay off upwards.

Installing the ABS relay

•

Insert the ABS relay with the FAG inscription fac-
ing the detent hook.

•

Tighten the screws at the relay base.

•

Push the relay base into the relay housing, at the 
same time pressing both engine cables into the 
left cable entries on the relay housing (red at bot-
tom, black at top).

•

Attach black engine cable to left threaded pin 
(M5) with crimp at back.

e

 Caution:

Make sure the cable is not at an angle, or its insula-
tion may be damaged.

•

Reconnect the 2-pin plug in the correct position, 
pushing the two halves fully together, and press 
the two wires into the center (smaller) cable en-
tries.

•

Push the two plugs for the connecting cable/wir-
ing harness onto the threaded pins with the 
crimp at the front.

•

Press the two cables into the remaining free ca-
ble entries. 

•

Tighten the nuts.

e

 Caution:

Always use new self-locking nuts.

•

Install a new cover (1).

e

 Caution:

When sliding the cover on, make sure that all cables 
are correctly located in their cable entries. Scrap 
the old cover.

Removing ABS relay base

e

 Caution:

Switch off ignition, disconnect and insulate the 
ground (earth) strap.

•

Remove cover (1) from ABS control unit, press in 
the lock with a screwdriver and pull the cover up.

•

Scrap the old cover (1).

•

Detach lines (2) and discard nuts. 

e

 Caution:

Make sure the cable is not at an angle, or its insula-
tion may be damaged.

•

Pull off 2-pin plug (3).

•

Take out relay base (4).

•

Remove screws at relay base with Torx T20.

•

Remove the ABS relay.

•

Press the contact interlock out of the relay base.

•

Release the plug from the relay side using spe-
cial tool No. 50000-017-507 from the Grote und 
Hartmann company. 

e

 Caution:

The contact has a double detent.
When pulling the plug out of the relay base, avoid 
applying too much tension to the cable.
If the cable breaks, the complete ABS unit will have 
to be exchanged.

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