BMW AG Motorcycle (K1100LT, K1100RS). Manual - part 32

34.1

Contents

Page

34

Technical Data

............................................................................................................................... 3

Removing and installing front brake caliper 

.................................................................5

Dismantling and assembling front brake caliper 

........................................................6

Dismantling front brake caliper

 .................................................................................................6

Assembling front brake caliper

 .................................................................................................7

Removing and installing brake pads

 ......................................................................................8

Removing and installing front brake disc

 .......................................................................9

Removing and installing ABS pulse wheel

 ..........................................................................9

Removing and installing front ABS sensor 

..................................................................10

Adjusting front ABS sensor gap 

.........................................................................................11

Removing and installing front brake line

 .......................................................................12

Removing upper brake line

 .......................................................................................................12

Removing lower brake line

 ........................................................................................................12

Removing and installing ABS brake line from front pressure modulator 

...13

Removing and installing handbrake cylinder 

.............................................................14

Bleeding brake 

.............................................................................................................................15

Bleeding front brake

 ....................................................................................................................15

Bleeding brake caliper .......................................................................................................................15
[ABS II] Bleeding pressure modulator  ................................................................................................16
Bleeding the handlebar fitting ............................................................................................................16

Bleeding rear brake

 ......................................................................................................................16

Bleeding brake caliper .......................................................................................................................16
[ABS II] Bleeding pressure modulator  ................................................................................................16

Removing and installing pressure modulator 

.............................................................17

[ABS I] Removing and installing front or rear pressure modulator

 ..........................17

[ABS II] Removing ABS unit

 ......................................................................................................18

34 Brakes

34.2

Contents

Page

[ABS II] Installing ABS unit

 ........................................................................................................19

[ABS II] Removing and installing relay and relay base 

..........................................20

[ABS II] Removing relay

 ..............................................................................................................20

[ABS II] Installing relay

 ................................................................................................................20

[ABS II] Removing relay base

 ..................................................................................................21

[ABS II] Installing relay base

 .....................................................................................................21

Removing and installing rear brake caliper 

.................................................................22

Removing and installing rear brake pads

 .....................................................................22

Dismantling and assembling rear brake caliper 

.......................................................23

Dismantling rear brake caliper

 ................................................................................................23

Assembling rear brake caliper

 .................................................................................................23

Removing and installing rear brake disc 

.......................................................................24

Removing and installing rear ABS sensor 

....................................................................25

Measuring vertical runout at rear pulse wheel 

..........................................................26

Removing and installing rear master brake cylinder 

..............................................27

Disassembling rear master brake cylinder

 ........................................................................28

Removing and installing brake pedal 

..............................................................................29

Adjusting foot brake pedal 

....................................................................................................30

Troubleshooting: Front wheel/rear wheel brake 

......................................................31

34.3

34

Technical Data

K 1100 LT

K 1100 RS

Brake fluid

DOT 4

Minimum brake pad thickness

mm (in) 1.5 (0.059)

Front wheel

Brake disc Ø

mm (in) 305 (12.01)

Brake disc thickness

mm (in) 5

± 0.1 

(0.197

 ± 0.0039

)

Minimum thickness

mm (in) 4.5 (0.177)

Brake pad surface

cm

2

 (in

2

) 100 (15.5)

Piston Ø of brake caliper

mm (in) 32/34 (1.26/1.34)

Piston Ø handbrake cylinder

mm (in) 20 (0.79)

ABS front sensor gap
(measured at max. distance point)

mm (in) 0.50...0.55 (0.0197...0.0216) Up to 1996 MY

0.45...0.55 (0.0177...0.0216) From 1997 MY

Rear wheel

Brake disc Ø

mm (in) 285 (11.22)

Brake disc thickness

mm (in) 5

± 0,2 

(0.197

 ± 0.00787

)

Minimum thickness

mm (in) 4.6 (0.181)

Permissible lateral runout

mm (in) 0.2 (0.0078)

Brake pad surface

cm

2

 (in

2

) 41.5 (6.43)

Piston Ø brake caliper

mm (in) 38 (1.496)

Piston Ø foot brake cylinder

mm (in) 12 (0.472)

ABS rear sensor gap
(measured at max. distance point)

mm (in) 0.60...0.65 (0.0236...0.0256) Up to 1996 MY

0.45...0.55 (0.0177...0.0216) From 1997 MY

34.4

34.5

Removing and installing front brake 
caliper

•

Mask off brake caliper at top of wheel side with 
tape (rim guard).

•

Release brake caliper mounting (1) and alterna 
tely press brake caliper against the brake disc 
and pull back (arrow) in order to press back the 
pistons.

•

Carefully remove brake caliper from brake disc.

e

 Caution:

Brake pads must not be damaged.

•

Release brake line at brake caliper and close off.

e

 Caution:

Ensure brake fluid does not come in contact with 
painted vehicle parts; brake fluid destroys the paint 
work.

•

Install in the reverse order of removal.

L

 Note:

Renew sealing rings.

X

 Tightening torques:

Brake caliper to slider tube .......................... 40 Nm
Brake line to brake caliper............................ 18 Nm
Bleed screw ................................................. 14 Nm

LT340010

1

LT340020

34.6

Dismantling and assembling front 
brake caliper

e

 Caution:

The brake caliper halves must not be unscrewed!

Dismantling front brake caliper

•

Remove the brake caliper.

•

Remove keeper from retaining pin (1).

•

Drive out the retaining pin (1) from the wheel side.

•

Pull the brake pads out downwards.

•

Seal the bleed screw.

X 

Tightening torque:

Bleed screw at brake caliper front ................ 14 Nm

•

Hold a cloth over the brake caliper.

•

Carefully press out brake pistons (2), using a 
compressed air gun at the brake line connection.

e

 Caution:

Do not allow your fingers to become trapped 
between the pistons; risk of injury.

•

Remove the two sealing rings (3,4) from the left/
right brake cylinder bores.

•

Examine the brake caliper pistons for damage.

LT340280

34 1 500

5

2

4

3

1

2

3

4

34.7

Assembling front brake caliper

•

Coat new sealing rings (3,4) with brake fluid and 
install. 

•

Coat brake caliper pistons (2) with brake fluid 
and insert.

e

 Caution:

Do not tilt the brake pistons when installing.

•

Using piston resetting tool (5),
BMW No. 34 1 500, press the pistons fully back.

•

Insert brake pads and secure with retainers.

LT340280

34 1 500

5

2

4

3

1

2

3

4

34.8

Removing and installing brake pads

•

Remove brake caliper.

L

 Note:

If only the brake pads are to be replaced, do not re 
lease the brake line at the brake caliper.

•

Drive out retaining pin (1).

•

Remove brake pads by pulling downwards.

e

 Caution:

Do not allow brake pads to wear down below the 
minimum thickness (arrow).
Replace pads only as complete set.

Minimum brake pad thickness:
Thickness on carrier plate ...........................1.5 mm

•

Install in the reverse order of removal.

L

 Note:

Before installing the brake pad, completely press 
back the pistons with the aid of the resetting tool (1), 
BMW No. 34 1 500.

LT340030

1

LT340040

1