34 21 200 Removing and Installing or Replacing Brake Pads on Both Rear Disc Brakes (Teves Floating Caliper)
34 21 200 Removing and installing or replacing brake pads on both rear disc brakes (Teves floating caliper)Special tools required:
Important!
^ Brake pad wear sensor: after removal it must be replaced (brake pad wear sensor loses its retention capability in the break pad).
^ Retaining spring: for vehicles older than 48 months it is recommended to replace the retaining spring!
So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces for the brake pads on the brake caliper mounting bracket. Instead, clean with brake cleaner BMW part no. 83 19 2 154 780 and apply a thin coating of brake pad paste BMW part no. 83 19 2 158 851.
Important!
European version only.
Sport brake pads for M3:
- Due to the increased strain on the brake discs, we recommend that you also replace the brake discs when fitting a new set of brake pads
- It is absolutely essential to replace the brake discs if cracked ≥ 13 mm even before the brake pad is worn
Necessary preliminary work:
^ Remove wheels.
^ Remove brake pad wear sensor
Lift out retaining spring (1).
Remove cover plug (1).
Important!
Tie brake caliper back and do not allow to hang from brake hose.
Unscrew guide bolts (1).
Remove brake caliper (2) by pulling forward.
Installation note:
Tightening torque 34 21 4AZ.
Clean guide screws only; do not grease.
Check threads.
Replace all guide bolts which are not in perfect condition.
Remove outer brake pad.
Inner brake pad is located with its spring in the piston.
Important!
Mark any worn brake pads.
In the event of one-sided brake pad wear, do not change brake pads round.
Clean brake pads.
Do not grease backs of brake pads sleeve.
Important!
When pressing down piston, note brake fluid level in expansion tank.
Overflowing brake fluid will damage the paint work.
Turn piston back fully with special tool 34 1 050.
Check minimum brake disc thickness:
- Position special tool 34 1 280 at three measuring points in area (1) and measure.
- Compare measurement result and lowest value with set point value.
Important!
New brake pads may only be fitted if the brake disc thickness is greater than the minimum brake disc thickness (MIN TH).
Check dust boot (1) for damage and replace if necessary.
Important!
Dust boot must not come into contact with brake pad paste as this may cause the dust boot to swell.
Clean contact surface (2) of brake piston with brake cleaner and apply a thin coating of brake pad paste.
Clean contact surfaces (1) of brake pad tee heads/brake caliper housing with brake cleaner and apply a thin coating of brake pad paste.
Clean contact surface (1) of brake caliper with brake cleaner and apply a thin coating of brake pad paste.
So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces (1) for the brake pads on the brake caliper mounting bracket.
Instead, clean with brake cleaner and apply a thin coating of brake pad paste.
Note:
After completing work:
- Fully depress brake pedal several times so that brake pads contact brake discs.
- When installing new brake pads at front and rear axles, brake fluid level must be brought up to "MAX" marking.
- Read and comply with notes on braking in new brake discs / brake pads.
- When replacing pads, reset CBS display in accordance with factory specification.
