Checking brake pads and discs for wear and replacing if necessary (Inspections II and Ill)
Checking brake pads for wear
Warning: Never permit brake pads to wear past minimum permissible thickness. Always replace pads as a complete set.
Front brake pads
Caution: Do not scrape the wheel - mask it off if necessary.
- Remove the brake calliper.
![](https://motoinstruction.ru/img/bmw/21/127039.jpg)
- Measure brake pad thickness (arrows).
Minimum pad thickness — 1.0 mm (0.04 in)
Tightening torques:
- Brake calliper to fork tube — 40 Nm
Rear brake pads
![](https://motoinstruction.ru/img/bmw/21/127040.jpg)
- Release the brake line from the clips (arrows) on the rear-wheel drive.
- Release fasteners (1, 2), remove brake calliper.
![](https://motoinstruction.ru/img/bmw/21/127041.jpg)
- Measure brake pad thickness (arrows).
Minimum pad thickness — 1.0 mm (0.04 in)
Tightening torques:
- Brake calliper to rear wheel drive — 40 Nm
Replacing brake pads
Front brake
Caution: Do not separate the two halves of the brake calliper. Do not scrape the wheel - mask it off if necessary.
- Remove the brake calliper.
![](https://motoinstruction.ru/img/bmw/21/127042.jpg)
- Remove the split-pin keeper (1) from retaining pin (2).
- Remove retaining pin (2).
- Remove brake pads by pulling downwards.
![](https://motoinstruction.ru/img/bmw/21/127043.jpg)
- 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.
- Check the function of the brake system.
Caution: The fluid level in the brake fluid reservoir must be at the "MAX" mark after the brake pads have been changed. It is not possible to check the maximum fill level at the inspection glass. See Checking the front brake fluid level for the procedure.
Tightening torque:
- Brake calliper to fork tube — 40 Nm
![](https://motoinstruction.ru/img/bmw/21/127044.jpg)
Rear brake
Caution: Do not separate the two halves of the brake calliper.
- Remove the brake calliper.
- Remove the split-pin keepers (2) from retaining pins (3).
- Pull out the retaining pins (3) and remove the retaining plate (1).
- Remove brake pads.
![](https://motoinstruction.ru/img/bmw/21/127045.jpg)
- 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. 341500.
![](https://motoinstruction.ru/img/bmw/21/127046.jpg)
- Note the installed position of the retaining plate (1).
- Check the function of the brake system.
Caution: The fluid level in the brake fluid reservoir must be at the MAX mark after the brake pads have been changed.
Tightening torque:
- Brake calliper to rear wheel drive — 40 Nm
Checking the brake discs
- Carefully check the brake discs for cracking, damage, deformation and scoring.
![](https://motoinstruction.ru/img/bmw/21/127047.jpg)
- Measure the thickness of the brake discs at several points with a calliper gauge.
Brake disc wear limits
- Front brake discs — 4.5 mm (0.18 in)
- Rear brake disc — 6.5 mm (0.26 in)