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Front Brake Rotor or Disc Replacement
 
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Pelican Technical Article:

Front Brake Rotor or Disc Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$60 to $200

Talent:

**

Tools:

18mm socket, T27 Torx, floor jack, jack stands, wheel chocks, safety glasses

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)

Parts Required:

Rotors, hardware

Hot Tip:

Use new slider bolts

Performance Gain:

Car stops better

Complementary Modification:

Replace Rotor or disk

Besides physical damage there are basically two ways your rotors can go bad on your Mercedes. The first way is they just wear out. All rotors have a minimum wear thickness on them (that is usually stamped on the rotor). Once they get below this thickness they need to be replaced. If you are going to measure the thickness of the rotors make sure to measure in several places, as the rotor can wear unevenly. The second way they go bad is by warping. If you are feeling a pulsing in the brake pedal when braking, and it is proportionate to the speed of the vehicle you probably have a warped rotor. This is usually caused by hot spotting the rotor by late braking then keeping the pad fully depressed on the rotor while stopped. The heat from the braking trapped by the pad over time will warp a rotor. Rotors can also get heavily grooved. This can also be a cause to replace them.

When replacing your rotors always replace them in pairs. You should also replace the brake pads as well, especially if the rotor was heavily grooved. You want to start with two flat surfaces (the rotor and pad) rubbing against each other when seating the new brakes in. This will lead to better braking performance and eventually longer life from the components.

This is also a good time to give the system a good bleed and get all of the braking system like new.

Safely jack up and support the front of the vehicle and remove the front wheels. Please see our article on safely lifting and supporting your Mercedes W204.

There is a T27 locating screw that helps hold the disk in place while the wheels are off (red arrow).
Figure 1

There is a T27 locating screw that helps hold the disk in place while the wheels are off (red arrow). These can get corroded over time and especially if you live in a four-season area. You are going to remove the brake caliper and pads to change the rotors but before you do have someone put their foot on the brake while you loosen the Torx screw. If you don't have someone around to help, you can place a screwdriver down between the fins on the rotor and caliper mount to stop it from spinning.

You are going to have to remove the caliper and should install new pads.
Figure 2

You are going to have to remove the caliper and should install new pads. Please see our article on front brake pad replacement for additional assistance.

Once you have the caliper off make sure to hang it from the suspension (red arrow); never let the caliper hang from the brake line.
Figure 3

Once you have the caliper off make sure to hang it from the suspension (red arrow); never let the caliper hang from the brake line.

Use a 18mm socket, and remove the two caliper mounting bolts (red arrows).
Figure 4

Use a 18mm socket, and remove the two caliper mounting bolts (red arrows).

The bolts are considered single use only and are microencapsulated on the ends.
Figure 5

The bolts are considered single use only and are microencapsulated on the ends. Make sure to replace the caliper hardware when performing this work.

With the bolts removed remove the caliper mount.
Figure 6

With the bolts removed remove the caliper mount.

Finish removing the T27 Torx screw.
Figure 7

Finish removing the T27 Torx screw. Use care. Once it is removed there is nothing holding the rotor in place, and you do not want to drop it on anything.

Remove the rotor by lifting off the hub.
Figure 8

Remove the rotor by lifting off the hub. Use care, as it is heavy.

Installation is the reverse of removal.
Figure 9

Installation is the reverse of removal. Make sure to use a wire brush and clean the hub flange so there is a clean flat and level surface to mount the new rotor to.

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