The brake rotors, also referred to as the brake disc, on a Mercedes is an important part of the braking system. The rotor is the round metal part that the caliper and the brake pads clamp with when the brakes are applied. Though rotors are designed to last for tens of thousands of miles, they often need to be replaced if they have become damaged or they are on a high-mileage Mercedes.
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Things you need
- Jack stand and jacks
- Brake cleaner
- Clean rags
- Socket set and ratchet
- Torx bits
- Allen wrenches
- Torque wrench
- Anti-seize compound
Loosen the lug nuts that hold the wheels on with a lug wrench. Using a jack, raise the car up and place it on jack stands. Remove the lug nuts, pull the wheels off and set them aside.
Spray brake cleaner onto the brake system, including the rotor, caliper, dust shield and brake line. Scrub any dirt, oil and debris off with a clean rag.
Remove the two bolts that hold the caliper onto the caliper bracket. On most Mercedes models this will be a star-shaped Torx bolt. Use the appropriately sized Torx bit to loosen the bolt. Make sure to inspect the bolt to make sure what type it is, or consult your workshop manual.
Slide the caliper off of the rotor. The caliper will still be attached to the soft brake line that delivers the brake fluid to the caliper. To avoid damaging the line from the weight of the caliper hanging on it, tie the caliper to a nearby suspension part or support it somewhere where it won't pull on the brake line.
Remove the small set screw that holds the rotor to the hub with an Allen wrench. Remove the rotor by pulling it away from the hub. If the rotor is frozen on from rust and dirt, use a rubber mallet to tap the rotor from behind and free it.
Spray brake cleaner on the surface that the new rotor is going to mount on. Wipe the area clean so that there is no dirt, rust or oil.
Clean the new rotors with brake cleaner and a clean rag. New rotors come with an anti-corrosion coating so that they don't rust before being installed on a vehicle. This needs to be removed before they are installed.
Place the new rotor onto the hub. You can also put a light coating of anti-seize material on the mounting surface to ease future removal of the rotor. Install the set screw for the rotor and tighten it with an Allen wrench.
Slide the caliper over the rotor. Install the caliper bolts and tighten them with a torque wrench to Mercedes' recommended setting for the model that you own. Repeat the above steps for the remaining rotors.
Replace the wheels and lower the vehicle to the ground.
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