Motorcycle BMW R1150RT. Manual - part 69

34.21

Bleeding front control circuit

•

Seal the reservoir by installing the rubber dia-
phragm and the reservoir cap.

•

Turn the handlebars to full left lock.

•

Repeatedly pull front brake lever lightly to expel 
air from brake master cylinder.

•

Switch off the brake bleeding device.

•

Set the handbrake lever to position 4.

d

 Warning:

When performing maintenance and repair work on 
BMW Integral ABS, never pump quickly or vigorous-
ly.

•

Remove reservoir cap with rubber diaphragm.

•

In the following sequence, bleed:

–

front metering cylinder (1),

–

front integral circuit (2),

–

front control circuit (3) and 

–

front metering cylinder (1) for the second time

using ring spanner, BMW No. 34 2 532, in accord-
ance with instructions for bleeding.

Instructions for bleeding:
1. Slowly pull brake lever until brake-light switch 
clicks (blow-by bore closed).
2. Open the bleed screw.
3. Slowly pull brake lever to full extent of its travel 
and close the bleed screw.
4. Slowly release the brake lever.
5. Repeat steps 1 to 4 until the bake fluid is clear 
and free of bubbles.

•

Fit the protective caps on the bleed screws.

•

Add brake fluid up to the “MAX” mark.

•

Wipe the rim of the reservoir, the rubber dia-
phragm and the cover to remove brake fluid, and 
carefully re-assemble the components.

•

Recheck the brake-fluid level.

•

Place the motorcycle on its centre stand.

•

Turn the handlebars fully to the left.

Specified level 
not below ......................................................... MIN
(top edge of the marking ring)

e

 Attention:

After all the work on the brake system has been 
completed, run a bleed test using the 
BMW MoDiTeC.

Brake fluid ...................................................DOT 4

R28340110

1

3

2

R22000140

34.22

Filling the rear control circuit

•

Remove rear reservoir cap with rubber dia-
phragm.

•

Top up the brake fluid level to the “MAX” mark.

e

 Attention:

While filling and bleeding the system, do not allow 
the brake fluid level to drop below the “MIN” mark, 
as otherwise air will be drawn into the brake system.

d

 Warning:

When performing maintenance and repair work on 
BMW Integral ABS, never pump quickly or vigorous-
ly.

•

Draw off the brake fluid from the circuits in the 
correct sequence while topping up continuously 
with fresh brake fluid and using ring 
spanner, BMW No. 34 2 532:

–

rear metering cylinder (1),

–

rear integral circuit (2),

–

rear control circuit (3) and 

–

rear metering cylinder (1) for the second time.

e

 Attention:

On account of the vacuum extraction process, it is 
not possible to tell whether there is brake fluid in the 
hose of the brake bleeding device when it is free of 
bubbles.
Consequently, the system must be bled again 
manually in the specified sequence and in ac-
cordance with the instructions for bleeding the 
brakes.

Bleeding the rear control circuit

•

Switch off the brake bleeding device.

•

In the following sequence, bleed:

–

rear metering cylinder (1),

–

rear integral circuit (2),

–

rear control circuit (3) and

–

rear metering cylinder (1) for the second time

using ring spanner, BMW No. 34 2 532, in accord-
ance with instructions for bleeding.

Instructions for bleeding:
1. Slowly depress brake lever until brake-light 
switch clicks (blow-by bore closed).
2. Open the bleed screw.
3. Slowly depress brake lever to full extent of its trav-
el and close the bleed screw.
4. Slowly release the brake lever.
5. Repeat steps 1 to 4 until the bake fluid is clear 
and free of bubbles.

R22000151

R28340110

1

2

3

34.23

•

Fit the protective caps on the bleed screws.

•

Top up the brake fluid at least until the level 
reaches the “MIN” mark.

•

Wipe the rim of the reservoir, the rubber dia-
phragm and the cover to remove brake fluid, and 
carefully re-assemble the components.

•

Recheck the brake-fluid level.

–

Place the motorcycle on its centre stand.

Specified level
not below ......................................................... MIN

e

 Attention:

After all the work on the brake system has been 
completed, run a bleed test using the 
BMW MoDiTeC.

Brake fluid....................................................DOT 4

R22000150

34.24

Filling and bleeding wheel circuits

e

 Attention:

Do not allow brake fluid to come into contact with 
painted parts of the motorcycle as brake fluid de-
stroys paint.

Filling and bleeding front wheel circuit

e

 Attention:

Integral brakes, the rear brake must be ready for 
use.

–

Install rear brake pads and brake caliper, if appli-
cable.

–

Place the motorcycle on its centre stand.

•

Open front wheel-circuit reservoir (1).

•

Remove front brake pads.

•

Wrap cloths around the left and right brake cali-
pers.

e

 Attention:

Do not scrape the wheel – mask it off if necessary.

•

Use resetting tool, BMW No. 34 1 531, and 
locator, BMW No. 34 1 532, to force the pistons 
in the left and right brake calipers all the way 
back and hold them in this position.

e

 Attention:

To prevent brake fluid entering plugs, do not discon-
nect plugs from the ABS pressure modulator.

•

Screw container, BMW No. 34 1 581, 
onto front wheel circuit reservoir.

•

Slowly fill container, BMW No. 34 1 581, with 
new brake fluid until it is approximately 1/2 full.

•

Connect the brake bleeding device to the bleed 
screw of the left brake caliper, but do not switch 
on the device.

L

 Note:

If necessary, use a cable tie to secure the bleed 
hose to the bleed screw.

•

Switch on the ignition.

L

 Note:

After switching on the ignition, always wait for the 
BMW Integral ABS to complete its self-diagnosis.
Do not operate the brake lever until self-diagnosis 
has completed.

R28340110

1

R22000290

34 1 531

34 1 532

R22000340

34 1 581