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Rear Brake Rotor or Disc Replacement
 
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Pelican Technical Article:

Rear Brake Rotor or Disc Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$60 to $250

Talent:

**

Tools:

18mm wrench, T30 Torx, floor jack, jack stands, wheel chocks, safety glasses, lug wrench, torque wrench

Applicable Models:

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

Parts Required:

Rotors, hardware

Hot Tip:

Clean the hub face

Performance Gain:

Car stops better

Complementary Modification:

Bleed brake system

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 from late braking then keeping the pad fully depressed on the rotor while stopped. Rotors can also get heavily grooved. This can also be a reason to replace them.

When replacing your rotors it is always a good idea to 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 brake 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 rear of the vehicle and remove the front wheels. Please see our article on safely lifting and supporting your Mercedes W204.

There is a T30 locating screw that helps hold the disk in place while the wheels are off (red arrow).
Figure 1

There is a T30 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 or set the braking brake while you loosen the Torx screw. Just remember to release the parking brake before removing the rotor.

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 rear brake pad replacement for additional assistance. Once you have the caliper off make sure to hang it from the suspension; never let the caliper hang from the brake line.

Use a 18mm wrench and remove the two caliper mounting bolts (red arrows).
Figure 3

Use a 18mm wrench and remove the two caliper mounting bolts (red arrows). The upper bolt is too close to the sway bar drop link to get a socket on.

The bolts are considered single use only and are micro encapsulated from the factory.
Figure 4

The bolts are considered single use only and are micro encapsulated from the factory. Make sure to replace the caliper hardware when performing this work.

With the bolts removed remove the caliper mount.
Figure 5

With the bolts removed remove the caliper mount.

Finish removing the T30 Torx screw.
Figure 6

Finish removing the T30 Torx screw. Use care. Once it is removed there is nothing holding the rotor in place. You do not want to drop it on anything.

Remove the rotor by lifting it off the hub.
Figure 7

Remove the rotor by lifting it off the hub. Use care, as it is heavy. If the rotor does not come off easily first make sure the parking brake is not on. Then try hitting the bell (inside part) with a rubber mallet to break up any corrosion that might have developed.

Installation is the reverse of removal.
Figure 8

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 too.

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