This article will give an overview how to change rear brakes on a typical 203 chassis style car. Parts may differ depending on car especially on cars with sports package. There a few different parts for the C-class so it is always a good idea to make sure you are getting the right parts by checking your VIN number.
Make sure you have all the tool and parts you need:
Secure the car with jack stands and remove the front wheels. This job can get dirty so it is recommended to wear gloves and some work clothes.
Now is a good time to clean the new rotors and spray the pads with anti-squeak. We have had best luck by using Castle anti-squeak and spraying one thick layer and letting it soak. Grease can also be applied now to all contacting parts. Try to use only Mercedes-Benz parts or OEM parts. Aftermarket parts have are known to squeak and make noise. Important: If your pads are very low or you are doing front and back, check the level of your brake fluid! If you have had to add fluid in the past you will have to suck some out now. Squeezing in the caliper pistons will push out brake fluid from the reservoir if the reservoir is full!
Check the level make sure it is not too full, or fluid will come out and you will have a mess!!
Use only Mercedes-Benz approved fluid.
Cleaning oil off new rotors
Grease applied to contact points don't forget the ears.
Mercedes-Benz brake grease part number 001 989 47 51
Loosen the rotor screw with a T30 Torx bit.
Knock out the brake pad clip retaining pin with a punch or other similar tool. Remove the pin it may be a little stuck. Remove the clip as well and put it to the side.
Knocking out pin.
Removing pin and clip
Now it is time to compress the calipers. You can use two large screwdrivers in a crossing pattern to do this. Make sure the piston is all the way in so the new pads will fit. The old brake pads can be removed now. If it has a sensor note the position of it.
Remove brake pads.
Cleaning dust and dirt from caliper with small wire brush.
Clean the caliper where it contacts the brake pads with a small wire brush. Solvent can be used for easier cleaning. This will be as far as you go if you are only changing pads. You can jump to step 11 to finish replacing pads.
Loosening caliper bolts.
Time to remove the caliper. The bolts are a little awkward to get to. You can secure the caliper by placing it on the axle behind the backing plate.
Time to remove the rotor: The hub should also be cleaned with a wire brush at this time too. This can help prevent brake noise.
Rotor ready for removal
Time to install new rotor and tighten rotor torx screw.
Install the 2 large caliper retaining bolts and tighten them to 115 Nm (85 Ft. lbs)
Install new brake pads. If the caliper piston as been completely compressed the pads should easily slide in. If there is a brake pad sensor replace it now.
Install brake pad clip and pin. The pin will have to be hammered in the last inch or so.
Installing pin. Make sure it is secure and all the way in.
Now it will have to be repeated for the other side.
Install wheels and torque to 95 Ft. lbs.
Time to brake in the car. Before starting the car push the brake pedal all the way down a couple of times. It is recommended you brake in the car in a place with no other traffic. Bring the car up to about 35mph and hit brakes and come to a complete stop. Repeat this 3 or 4 more times. This will seat the brakes correctly. Now you have new brakes that wont make any noise for a while! This is only a guide. If you do not have the tools or do not feel comfortable doing this type of work have a professional do it for you!!!
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