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Pelican Technical Article:

Brake Rotor Replacement

Kerry Jonsson

Time:

1 hour1 hr

Tab:

$100

Talent:

***

Tools:

5mm, 7mm Allen head, possible hammer

Applicable Models:

Mercedes-Benz R129 (1990-02)

Parts Required:

Brake rotor

Hot Tip:

Use a hand impact tool if the fasteners are tight

Performance Gain:

Improve braking and reduce brake squeal

As you step on your brake pedal the piston in the master cylinder pushes hydraulic fluid through the brake lines, to the calipers, and finally forces the brake pad into the brake rotor.  The rotor is attached to the spindle and slows down the car.  Brake rotors need to absorb a lot of heat during heavy braking. If they can't get rid of the heat fast enough they may warp.  This will lead to a vibration in the steering wheel during braking.  Also, if the brake rotor has grooves from wear it will make and allow squealing noise while braking. As the brake pads rub against the rotor the brake rotor will also wear out. Manufacturers have specifications on what the minimum thickness a brake rotor should be. You can use a dial micrometer to measure this thickness and verify the brake rotors need to be replaced. In this tech article we will show you how to replace your brake rotors.

In order to replace your brake rotors you are going to need to lift and support your vehicle.  See our tech article on jacking up and supporting your vehicle.  You will still need to remove your brake calipers. See our tech article on brake caliper removal for further instructions.

Front Rotor Removal:
Front Rotor Removal.
Figure 1

Front Rotor Removal: This picture illustrates the left side front rotor with the brake caliper already removed. Remove the 5 mm Allen head fastener (green arrow) that mounts the brake rotor to the hub flange.

Front Rotor Removal.
Figure 2

Front Rotor Removal: I like using a hand impact tool to loosen the screw. Hold the tool firmly and hit the back of it with a hammer. See the instruction manual for your specific tool design. Set the tool to counter clockwise and as you hit it with a hammer the tool will twist counterclockwise therefore loosening the fastener.

Front Rotor Removal.
Figure 3

Front Rotor Removal: If the brake rotor is seized on the hub flange you can tap it off with a hammer. Lubricate around the center of the hub where the opening in the brake hub rests on the hub flange. Installation is the reverse of the removal steps. Fit the brake rotor onto the hub flange. Install and tighten the fastener. Install your brake caliper and brakes. See our tech articles on brake caliper removal and brake pad removal.

Rear Rotor Removal:
Rear Rotor Removal.
Figure 4

Rear Rotor Removal: This picture illustrates the left side rear rotor with the brake caliper already removed. Remove the 5 mm Allen head fastener (green arrow). You can use the hand impact tool if the fastener is tight.

Rear Rotor Removal.
Figure 5

Rear Rotor Removal: If the brake rotor is seized on the hub flange you can tap it off with a hammer.

Rear Rotor Removal There is a chance the rotor will be very difficult to get off because of the lip formed on the inner part of the brake rotor from the parking brake shoes.
Figure 6

Rear Rotor Removal: There is a chance the rotor will be very difficult to get off because of the lip formed on the inner part of the brake rotor from the parking brake shoes. You are going to have to adjust the parking brake anyway because of the new rotors. Rotate the brake rotor until there is one lug fastener hole at the 2 o'clock position. Use a flat head screw driver to insert in the lug fastener hole and lever up on the adjustment pawl in the direction of the blue arrow to bring the parking brake shoe in. (if needed use a flashlight to peak inside the rotor and locate the adjuster). It should now be easier to pull off the rotor. Installation is the reverse of the removal steps. Fit the brake rotor onto the hub flange. Install and tighten the fastener. Install your brake caliper and brakes. See our tech articles on brake caliper removal and brake pad removal.

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Comments and Suggestions:
shams Comments: Thank you, can you e-mail me and let me know if this dust cover plate is available
and how much it costs?. Should I change both the rear ones or just one will do the
job. Thanks again
May 7, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
shams Comments: I have e Mercedes E320- year 2003 sedan 4 door auto. I need a rear brake rotor
cover which sits behind the rotor in passenger side rear braks. Can you help.
The car came down while changing the tire, and that cover plat is grinding on the back of the rotor and making scratching noises. Can you help?.. thanks
April 27, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 

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