Replacement: brake pads – Mercedes W204. Tip from AUTODOC experts:
Perform the replacement of brake pads in complete set for each axis. This provides effective braking.
The replacement procedure is identical for all brake pads on the same axle.
Please note: all work on the car – Mercedes W204 – should be done with the engine switched off.
Carry out replacement in the following order:
Step 1
Open the bonnet. Unscrew the brake fluid reservoir cap.
Step 2
Secure the wheels with chocks.
Step 3
Loosen the wheel mounting bolts. Use wheel impact socket #17.
Step 4
Raise the car.
Replacement: brake pads – Mercedes W204. Tip from AUTODOC:
If you are using a jack, make sure it rests on a flat surface without any unevenness.Be sure to additionally secure the car with jack stands.
Step 5
Unscrew the wheel bolts. Use wheel impact socket #17.
AUTODOC recommends:
Warning! To avoid injury, hold the wheel while unscrewing the fastening bolts. Mercedes W204
Step 6
Remove the wheel.
Step 7
Detach the connector of the brake pad wear sensor. Use long nose pliers.
Step 8
Spread the brake pads. Use a crowbar.
Step 9
Clean the brake caliper fasteners. Use a wire brush. Use WD-40 spray.
Step 10
Unscrew the brake caliper fasteners. Use a combination spanner #17. Use a drive socket #13. Use a ratchet wrench.
Step 11
Remove the fastening bolts.
Step 12
Remove the brake caliper.
Replacement: brake pads – Mercedes W204. 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.
Step 13
Remove the brake pads.
Replacement: brake pads – Mercedes W204. Tip:
Measure the brake disc thickness. Upon reaching the wear limit the part must be replaced.
Step 14
Clean the brake caliper bracket from dirt and dust. Use a wire brush. Use a brake cleaner.
AUTODOC recommends:
Replacement: brake pads – Mercedes W204. After applying the spray, wait a few minutes.Check the brake caliper bracket, brake caliper guide pins and boots. Clean them. Replace, if necessary.
Step 15
Treat the brake pads in the area where their surface comes into contact with the brake caliper bracket. Use anti-squeal paste.
AUTODOC recommends:
Make sure the disc surface is clean before installing the pads.
Step 16
Install new brake pads.
Step 17
Treat the brake caliper piston. Use a nylon cleaning brush. Use a brake cleaner.
AUTODOC recommends:
After applying the spray, wait a few minutes.
Step 18
Press in the brake caliper piston. Use brake caliper wind back tool.
Step 19
Install the brake caliper and fix it.
Step 20
Install the fastening bolts.
Step 21
Tighten the brake caliper fasteners. Use a combination spanner #17. Use a drive socket #13. Use a torque wrench. Tighten it to 34 Nm torque.
Step 22
Treat the brake pad wear sensor plug. Use dielectric grease.
Step 23
Attach the connector of the brake pad wear sensor.
Step 24
Clean the wheel rim mounting seat. Use a wire brush.
Step 25
Treat the surface where the brake disc contacts the wheel rim. Use ceramic grease.
Step 26
Clean the brake disk surface. Use a brake cleaner.
AUTODOC recommends:
After applying the spray, wait a few minutes.
Step 27
Install the wheel.
AUTODOC recommends:
Warning! To avoid injury, hold the wheel while screwing in the fastening bolts on the car. Mercedes W204
Step 28
Screw in the wheel bolts. Use wheel impact socket #17.
Step 29
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 30
Remove the jacks and chocks.
AUTODOC recommends:
Without starting the engine, press the brake pedal several times until you feel significant resistance.Check the brake fluid level in the expansion tank and refill if necessary.
Step 31
Tighten the brake fluid reservoir cap. Close the hood.
Replacement: brake pads – Mercedes W204. Tip from AUTODOC:
Slow down smoothly for first 150-200 km after the brake pads replacement. Avoid unneccessary and sharp braking to a stop.
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