BMW AG Motorcycle (K1100LT, K1100RS). Manual - part 35

34.25

Removing and installing rear ABS 
sensor

•

Remove brake caliper but do not loosen brake 
line.

•

Release sensor with socket wrench, 
BMW No. 00 2 640.

•

Disconnect plug connection (1) for sensor line.

•

Install in the reverse order of removal.

e

 Caution:

Check sensor spacing where the gap is greatest; if 
necessary, adjust with spacer plates (3).
Carefully lay sensor line.

Sensor gap 
Up to 1996 model year..................0.60 ... 0,65 mm

................................................ (0.0236...0.0256 in)

From 1997 model year on  ............0.45 ... 0.55 mm

................................................ (0.0177...0.0216 in)

X

 Tightening torque:

Sensor ..........................................................  4 Nm

LT340160

2

1

34.26

Measuring vertical runout at rear 
pulse wheel

•

Remove brake caliper.

•

Remove rear wheel.

•

Secure dial gauge with retaining fixture to bottom 
of spring strut mounting. 

•

Position dial gauge with measuring shoe (1), 
BMW No. 34 2 510, on pulse wheel.

•

Set dial gauge to zero.

•

Measure vertical runout over the entire circum-
ference.

•

Mark the point with the least vertical runout with 
oil paint.

•

Adjust the sensor spacing at this point.

Sensor spacing
Up to 1996 model year..................0.60 ... 0,65 mm

................................................ (0.0236...0.0256 in)

From 1997 model year on  ............0.45 ... 0.55 mm

................................................ (0.0177...0.0216 in)

LT340170

1

34 2 520

34 2 510

34.27

Removing and installing rear master 
brake cylinder

•

Drain brake system.

e

 Caution:

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

•

Release brake line (1) at master brake 
cylinder (2).

•

Remove footrest plate.

•

Release master brake cylinder (2).

•

Note spacer sleeve (3); spring is under pressure.

•

Open clip (4) on the supply line, detach line.

•

Install in the reverse order of removal.

e

 Caution:

Carefully bleed brake system.

X

 Tightening torques:

Master brake cylinder..................................... 9 Nm
Brake line to master brake cylinder .............. 18 Nm

LT340180

1

2

3

4

LT340190

3

34.28

Disassembling rear master brake cyl-
inder

e

 Caution:

Piston is under spring loading.

•

Using thrust piece (1), push piston (2) a little way 
inwards.

•

Press out stop screw (3).

•

Pull out piston with spring (4).

•

Loosen spring from ring groove.

•

Check piston and sealing rings (5) for damage.

•

Install in the reverse order of removal.

L

 Note:

Lightly coat sealing rings with brake fluid before in 
stalling.

LT340200

1

4

5

2

3

34.29

Removing and installing brake pedal

•

Remove footrest plate.

•

Detach sealing gaiter (1) at master brake cylin-
der.

•

Release mounting (2) for brake pedal.

e

 Caution:

Spring is under tension.

•

Remove bearing bush (3).

•

Install in the reverse order of removal.

L

 Note:

Grease bearing bush with „Shell Retinax A“ or 
similar.

X

 Tightening torque:

Brake pedal.................................................. 25 Nm

LT340210

3

2

1

34.30

Adjusting foot brake pedal

•

Loosen locknut (1).

•

Perform basic setting with adjusting screw (2).

•

Adjust distance „A“ with feeler gauge.

Basic setting:
Distance „A“ ............................ 0.2 mm (0.00787 in)

•

Turn adjusting screw (3) on master brake cylinder 
until slight resistance is felt when the foot brake 
pedal is operated.

•

Firmly tighten locknut, and remove feeler gauge.

X

 Tightening torque:

Locknut, 
adjusting screw on master brake cylinder ...... 6 Nm

LT340220

3

1

2

1

A

34.31

Troubleshooting: Front wheel/rear wheel brake

Brake rubs/vibrates.

no

Check brake pads.
Are brake pads worn/damaged?

yes

Renew brake pads.

Brake pedal soft/spongy.

no

Check brake fluid.
Is brake fluid too low?

yes

Top up brake fluid to MAX level.

no

Check brake system.
Is there air in brake system?

yes

Bleed brake system.

no

Check brake system.
Is brake system leaking?

yes

Repair leaks.

Brake pedal difficult to move/hard.

no

Check brake pads.
Are brake pads glazen/worn?

yes

Renew brake pads.

no

Check brake piston/brake cylinder.
Does brake piston/brake cylinder jam?

yes

Replace brake piston/brake cylinder

no

Check brake system.
Is supply from brake fluid reservoir blocked?

yes

Clean brake fluid reservoir/brake line.

34.32

Reduced brake effect when applied hard?

no

Check brake fluid.
Has brake fluid aged?

yes

Renew brake fluid.

Only mederate brake effect?

no

Check brake pads.
Are brake pads worn/damaged?

yes

Renew brake pads.

no

Check brake system.
Is there air in brake system?

yes

Bleed brake system.

Brakes squeak.

no

Check brake pads.
Are brake pads dirty?

yes

renew brake pads.

no

Check brake discs.
Is lateral runout of brake discs too large?

yes

Replace brake discs.

no

Check wheels.
Is axial runout too large?

yes

Renew wheels.