Removing and installing rear brake calliper
Caution: Do not allow brake fluid to come into contact with painted parts of the motorcycle, because brake fluid destroys paint.
- Drain the brake system
![](https://motoinstruction.ru/img/bmw/21/127432.jpg)
Caution: Do not separate the two halves of the brake calliper.
- Release the brake hose from the clips (arrows) on the rear-wheel drive.
- Remove fasteners (1, 3), and remove brake calliper.
- Remove the brake pads.
See Group 00.
- Remove banjo bolt (2) for brake hose from brake calliper and remove brake hose.
Note: Clean ABS sensor and bore before removing/install-
![](https://motoinstruction.ru/img/bmw/21/127433.jpg)
- Remove screws (1, 2) and remove ABS sensor with spacer plate (3).
- Installation is the reverse of the removal procedure: pay particular attention to the following.
- Replace sealing rings of banjo bolt for brake hose.
Caution: Do not damage the brake pads when installing.
- If necessary, press the brake pads/pistons fully back with resetting tool, BMW No. 34 1 500.
- Check/adjust ABS sensor gap.
- Sensor gap — 0.45...0.55 mm (0.018...0.022 in)
Tightening torques:
- Brake calliper to rear wheel drive — 40 Nm
- Brake hose to brake calliper — 18 Nm
- Bleed screw in brake calliper — 10 Nm
- ABS sensor to brake calliper — 4 Nm
Removing and installing rear brake pistons
- Remove rear brake calliper.
- Remove the brake pads.
See Group 00.
- Remove pressure pads from brake pistons.
- Use piston resetting tool, BMW No. 34 1 500, to locate two opposing brake pistons.
- Insert a piece of cloth between the two brake pistons not located by the resetting tool.
Warning: Do not allow your fingers to become trapped between the pistons; risk of injury.
- Carefully press out one of the brake pistons, by applying a compressed air gun to the brake hose connection.
![](https://motoinstruction.ru/img/bmw/21/127434.jpg)
- Wrap a cloth or similar as tightly as possible around the empty bore for the brake piston and secure in place with adhesive tape (arrow).
- Carefully press out the second brake piston, by applying the compressed air gun to the brake hose connection.
- Check brake pistons for hairline cracks, scores and damage.
- Remove the sealing rings from the bores for the brake pistons.
- Coat new sealing rings with brake fluid and install.
Caution: The brake pistons have a tendency to tilt in their bores during installation: always be careful to keep the pistons square to their bores when installing.
- Coat the brake pistons with brake fluid and carefully insert them into their bores.
- Remove and install the other two brake pistons in the same way.
- Installation is the reverse of the removal procedure: pay particular attention to the following.
- Before installing the brake calliper, force the pistons fully back with resetting tool, BMW No. 34 1 500.