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Home >> BMW >> 2024 >> M240i >> Repair and Diagnosis >> Brakes >> Traction Control >> Brakes -- Repair (G42) >> 34 21 Rear Brakes >> 34 21 320 Removing and installing/replacing both brake discs >> Remove rear brake rotor

Remove rear brake rotor

WARNING: Unintentional engagement of the parking brake. 
Injury hazard! 
  • On vehicles with "Remote Engine Start" (SA1 CR): 
  • Starting the engine while working on the braking system is strictly forbidden. The parking brake is automatically engaged when starting the engine by "Remote Engine Start".
  • Deactivate the function "Remote Engine Start".
  • Open the hood before working on the brake system in order to prevent the engine from starting.
WARNING: Vehicle may slip off the vehicle hoist if the vehicle hoist is handled incorrectly. 
Danger! Immobilization period-threatening injuries! 
CAUTION: Effects on other persons. 
Injury hazard! Risk of damage! 
  • Make sure that no other persons are in or around the vehicle.
NOTE: TECHNICAL INFORMATION 
During work on the rear brake, it must be ensured that the button for the electromechanical parking brake cannot be pressed.
NOTE: TECHNICAL INFORMATION 
General information on changing the brake pads: 
For vehicles older than 48 months it is recommended to replace the retaining spring or expanding spring.
The brake pad wear sensor must be replaced once it has been removed because the brake pad wear sensor loses its retention capability in the brake pad.
A CBS reset must be done after every brake pad exchange:
A CBS reset in the vehicle is possible in the event of a partially ground down  brake pad wear sensor. The CBS display in the Central Information Display (CID) is active.
In the event of a brake pad wear sensor that is not partially ground down,  a CBS
reset is only possible with the diagnostic system. No CBS display in the Central Information Display (CID).
If adhesive bonded brake pads are installed, the brake pads must be replaced after releasing the adhesive bond!
NOTE: TECHNICAL INFORMATION 
To prevent damage to the surface coating: With floating calipers on the brake caliper mounting bracket or with fixed calipers in the brake caliper housing, do not clean the contact surfaces for the brake pads to the extent that it is possible.
Clean the contact surfaces with brake cleaner (BMW part number 83 19 2 154 780). Next, apply a thin coat of brake pad paste (BMW part number 83 19 2 158 851 for 3g, or 83 192 158 852 for 100 g).
Spread brake pad paste on the marked surfaces with a brush.
For additional information see: GUIDELINE FOR APPLYING BRAKE PAD PASTE ON BRAKE PADS AND BRAKE ANCHOR PLATE .

Preliminary work