Replacement: brake discs – Mercedes W211. Tip from AUTODOC experts:
Replace the brake disks on the car Mercedes W211 in complete set for each axis. Regardless of the state of components. This will ensure even braking.
The replacement procedure is identical for both brake disks on the same axle.
When changing the brake discs, always replace the brake pads.
All work should be done with the engine stopped.
Replacement: brake discs – Mercedes W211. Take the following steps:
Step 1
Open the bonnet.
Step 2
Connect the service equipment and switch the SBC system to service mode.
Please note!
Some vehicles may not have the SBC system.
Step 3
Unscrew the brake fluid reservoir cap.
Step 4
Secure the wheels with chocks.
Step 5
Loosen the wheel mounting bolts. Use wheel impact socket #17.
Step 6
Raise the front of the car and secure on supports.
Step 7
Unscrew the wheel bolts.
AUTODOC recommends:
Warning! To avoid injury, hold the wheel while unscrewing the fastening bolts. Mercedes W211
Step 8
Remove the wheel.
Step 9
Detach the connector of the brake pad wear sensor. Use round-nose pliers.
Step 10
Spread the brake pads. Use a crowbar.
Step 11
Clean the brake caliper fasteners. Use a wire brush. Use WD-40 spray.
Step 12
Unscrew the brake caliper fastening. Use a combination spanner #17. Use a drive socket #13. Use a ratchet wrench.
Step 13
Remove the brake caliper.
Replacement: brake discs – Mercedes W211. Tip from AUTODOC:
Tie the caliper to the suspension or to the body with a wire without disconnecting from the brake hose to prevent depressurization of the brake system.Make sure that the brake caliper is not hanging on the brake hose.Don't press the brake pedal after the brake caliper has been removed. As a result, the piston can fall out from the brake cylinder, and brake fluid leakage and depressurization of the system may occur. Check the brake caliper bracket, brake caliper guide pins and boots. Clean them. Replace, if necessary.
Step 14
Treat the brake caliper piston. Use a nylon cleaning brush. Use a brake cleaner.
AUTODOC recommends:
Replacement: brake discs – Mercedes W211. After applying the spray, wait a few minutes.
Step 15
Install the brake caliper wind back tool.
Step 16
Remove the brake pads.
Step 17
Disconnect the brake pads wear sensor.
Step 18
Clean the brake caliper bracket fasteners. Use a wire brush. Use WD-40 spray.
Step 19
Unscrew the caliper bracket fastening. Use a drive socket #21. Use a tap wrench. Use a ratchet wrench.
Step 20
Remove the caliper bracket.
Step 21
Clean the brake disc fasteners. Use a wire brush. Use WD-40 spray.
Step 22
Unscrew the brake disc fastening. Use Torx T30. Use an impact screwdriver.
Step 23
Remove the brake disc.
Step 24
Clean the hub. Use a wire brush. Treat the contacting surface. Use copper grease.
Step 25
Install the brake disc.
Step 26
Tighten the brake disc fastening. Use Torx T30. Use a torque wrench. Tighten it to 8 Nm torque.
Step 27
Clean the brake caliper bracket from dirt and dust. Use a wire brush. Use a brake cleaner.
AUTODOC recommends:
Replacement: brake discs – Mercedes W211. After applying the spray, wait a few minutes.
Step 28
Install the brake caliper bracket.
Step 29
Tighten the brake caliper bracket. Use a drive socket #21. Use a torque wrench. Tighten it to 115 Nm torque.
Step 30
Install the brake pads.
Step 31
Connect the brake pads wear sensor.
Step 32
Press in the brake caliper piston. Use brake caliper wind back tool.
Step 33
Install the brake caliper and fix it. Use a combination spanner #17. Use a drive socket #13. Use a torque wrench. Tighten it to 35 Nm torque.
Step 34
Attach the connector of the brake pad wear sensor.
Step 35
Treat the surface where the brake disc contacts the wheel rim. Use copper grease.
Step 36
Clean the brake disk surface. Use a brake cleaner.
AUTODOC recommends:
Replacement: brake discs – Mercedes W211. After applying the spray, wait a few minutes.
Step 37
Install the wheel.
AUTODOC recommends:
Important! Hold the wheel while screwing in the fastening bolts. Mercedes W211
Step 38
Screw in the wheel bolts. Use wheel impact socket #17.
Step 39
Lower the car and working in a cross order, tighten the wheel bolts. Use wheel impact socket #17. Use a torque wrench. Tighten it to 130 Nm torque.
Step 40
Remove the jacks and chocks.
Step 41
Switch the SBC system to operating mode and disconnect the service equipment.
Replacement: brake discs – Mercedes W211. Tip from AUTODOC:
Check the brake fluid level in the expansion tank and refill if necessary.
Step 42
Tighten the brake fluid reservoir cap. Close the hood.
Replacement: brake discs – Mercedes W211. Tip from AUTODOC experts:
Without starting the engine, press the brake pedal several times until you feel significant resistance.
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