Replacing the dust boot on the rear brake caliper
WARNING:
Vehicle may slip off the vehicle hoist if the vehicle hoist is handled incorrectly.
Danger! Immobilization period-threatening injuries!
Danger! Immobilization period-threatening injuries!
- Observe safety instructions on raising the vehicle using a vehicle hoist.
- For additional information see: 00... Raise the vehicle using a VEHICLE LIFT .
CAUTION:
Effects on other persons.
Injury hazard! Risk of damage!
Injury hazard! Risk of damage!
- Make sure that no other persons are in or around the vehicle.
Preliminary work
- Remove the rear left and right WHEELS .
- Remove rear brake pad WEAR SENSOR .
- Remove rear BRAKE PADS .
- Measure (rear brake) minimum brake DISC THICKNESS .
NOTE:
TECHNICAL INFORMATION
During work on the rear brake, it must be ensured that the button for the electromechanical parking brake cannot be pressed.
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 using an appropriate scan tool. 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!
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 using an appropriate scan tool. 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 3 g) or 83 19 2 158 852 fr 100 g).
Spread brake PAD PASTE on the marked surfaces with a brush.
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 3 g) or 83 19 2 158 852 fr 100 g).
Spread brake PAD PASTE on the marked surfaces with a brush.
- Use a suitable tool to remove dust boot (1) from brake caliper (2) and then dispose of dust boot.
Do not reuse the dust boot.
- Use a lint-free cloth to clean the contact surface of the dust boot at the brake caliper housing (1) and at the annular groove (2) of the brake piston.
- Carefully check the brake caliper housing cylinder and the brake piston for damage.
Replace corroded or damaged components.
- To ensure that the dust boot fits perfectly: keep the area between the dust boot and brake caliper housing dry.
- Pull the sealing lip (1) of the dust boot (2) over the brake piston until the dust boot (2) fits completely inside the annular groove of the brake piston.
- Position the dust boot (2) uniformly on the contact surface of the brake caliper housing and press it in uniformly.
The dust boot must be positioned correctly around the entire brake caliper housing and on the brake piston annular groove.
Follow-up work
- Grease BRAKE PADS , brake anchor plate and brake caliper with brake pad paste.
- Install rear BRAKE PADS .
- Install the rear brake pad WEAR SENSOR .
- Install the left and right rear WHEEL .
- START-UP OR BEDD IN new brake pads and blades (rear brake).