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Parking Brake Shoes Replacement
 
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Pelican Technical Article:

Parking Brake Shoes Replacement

Kerry Jonsson

Time:

1 hour1 hr

Tab:

$100

Talent:

**

Tools:

11mm, 14mm line wrench

Applicable Models:

Mercedes-Benz W211 (2003-09)

Parts Required:

Brake lines

Hot Tip:

Use large metal pan to catch brake fluid

Performance Gain:

Fix sticking caliper

Your parking brake system is not a hydraulic brake system like your regular brake system. It uses a series of levers, cables and linkages to act on the parking brake shoes. When you step on your parking brake pedal the pedal linkage pulls on a parking brake cable that runs all the way to the rear brakes of your car. The cable pulls on a linkage that spreads the parking brake pads apart. The parking brake pads are mounted in the inner drum of the rear brake rotor and clamp inside the drum section to hold the rotor, and therefore the car, still. Parking brake pads can wear out over time and need to be replaced. In this tech article we will go over the steps to replace your parking brake shoes.

In order to replace your brake shoes you will need to lift and support your vehicle. See our tech article on jacking up and supporting your vehicle.

Working at the vehicle interior on the driver side pull the parking brake release handle to make sure the parking brake is fully released.
Figure 1

Working at the vehicle interior on the driver side pull the parking brake release handle to make sure the parking brake is fully released. There is no cable adjustment at the parking brake pedal to worry about.

Turn on the ignition key and step on the brake.
Figure 2

Turn on the ignition key and step on the brake. Put the transmission into neutral. This is so you can rotate the rear wheels as needed.

ThisPicture illustrates the right rear brake assembly with the wheel removed.
Figure 3

This picture illustrates the right rear brake assembly with the wheel removed. Use a flat head screwdriver to lever off the anti-rattle spring and pull it out of the caliper.

Unplug the electrical connector for the brake pad wear sensor by squeezing the electrical connector and pulling it straight out of the other side of the connection.
Figure 4

Unplug the electrical connector for the brake pad wear sensor by squeezing the electrical connector and pulling it straight out of the other side of the connection.

ThisPicture illustrates the inside view of the right rear brake caliper.
Figure 5

This picture illustrates the inside view of the right rear brake caliper. Remove the two T40 Torx caliper mounting pins recessed in the rubber caliper slides (green arrows). There may be covers that pop out of the rubber inserts. Our car did not have them.

I like using a large flat head screw driver to lever the caliper over and force the caliper piston back into the caliper.
Figure 6

I like using a large flat head screw driver to lever the caliper over and force the caliper piston back into the caliper.

Remove the caliper from its brake caliper bracket.
Figure 7

Remove the caliper from its brake caliper bracket. Use a hook to support it or rest it on the spindle. Do not let it hang by the brake line as this will damage the line.

Remove the outer brake pad from the caliper bracket.
Figure 8

Remove the outer brake pad from the caliper bracket.

This photo illustrates the rear caliper bracket on the right rear wheel with the caliper removed.
Figure 9

This photo illustrates the rear caliper bracket on the right rear wheel with the caliper removed. Remove the two 18mm fasteners (green arrows) for the caliper bracket.

Remove the caliper bracket from the spindle.
Figure 10

Remove the caliper bracket from the spindle.

Remove the T40 Torx fastener (green arrow).
Figure 11

Remove the T40 Torx fastener (green arrow).

You can use this commercially available hand impact tool.
Figure 12

You can use this commercially available hand impact tool. You can set it to rotate clockwise or counter clockwise to loosen. Hold on to the tool firmly and hammer on the end of it to loosen the fastener.

If the brake rotor is stuck on the hub you can use a hammer to tap it off.
Figure 13

If the brake rotor is stuck on the hub you can use a hammer to tap it off. Wear eye protection while hammering. Installation is the reverse of the removal steps. Fit the rotor onto the hub flange and tighten the single fastener. Install the caliper bracket and follow the instructions on brake pad removal to finish installing the brake pads and brake caliper.

There is a chance the brake rotor may not come off because of a lip on the inner part of the rotor from rubbing against the parking brake shoes.
Figure 14

There is a chance the brake rotor may not come off because of a lip on the inner part of the rotor from rubbing against the parking brake shoes. You may need to adjust the parking brake shoes inward to be able to remove the brake rotor. Rotate the brake rotor until the brake fastener hole is between approximately the 9 and 10 oÂ'clock position. Insert a flat head screwdriver into the hole and insert it into the gears on the parking brake adjustment pawl. Lever in the direction of the blue arrow to retract the pawl adjustment and allow the pads to come inward. Now it should be much easier to remove the brake rotor from the hub.

Pull the brake rotor off of the hub flange.
Figure 15

Pull the brake rotor off of the hub flange.

Spin the hub flange until one of the large holes lines up with the parking brake shoe mounting springs.
Figure 16

Spin the hub flange until one of the large holes lines up with the parking brake shoe mounting springs. Using a pair of needle nose pliers insert it inside the upper parking brake shoe mounting spring and grip the middle tang. Push the spring in and twist it 90° to unhook the spring from the backing plate. You may have to wiggle around the spring to get it to unhook from the backing plate.

Pull the spring completely out of the hub flange.
Figure 17

Pull the spring completely out of the hub flange.

Perform the same task as the upper parking brake shoe mounting spring on the lower parking brake shoe mounting spring.
Figure 18

Perform the same task as the upper parking brake shoe mounting spring on the lower parking brake shoe mounting spring. Using a pair of needle nose pliers insert it inside the lower parking brake shoe mounting spring and grip the middle tang. Push the spring in and twist it 90° to unhook the spring from the backing plate. You may have to wiggle around the spring to get it to unhook from the backing plate. Pull the spring out of the hub flange when you get it unhooked.

The parking brake springs are too strong to pull apart to get the parking brake shoes around the hub flange.
Figure 19

The parking brake springs are too strong to pull apart to get the parking brake shoes around the hub flange. I like to lever down on the lower brake shoe or lever up on the upper brake shoe to separate the pads on the side of the adjuster until the adjuster dislodges.

Pull the adjuster out from between the two brake shoes.
Figure 20

Pull the adjuster out from between the two brake shoes. This will allow the spring to pull the two shoes closer together.

Bring the two shoes together and unhook the parking brake shoe return spring (green arrow) out of the slot for it in the brake shoe (yellow arrow).
Figure 21

Bring the two shoes together and unhook the parking brake shoe return spring (green arrow) out of the slot for it in the brake shoe (yellow arrow).

Now you can pull the parking brake shoes apart from around the hub flange with only one spring holding them together.
Figure 22

Now you can pull the parking brake shoes apart from around the hub flange with only one spring holding them together. Keep in mind the position of the brake shoes in the spreading mechanism so you know where to put them for installation.

Clean the backing plate with brake parts cleaner and apply a small amount of grease to the backing plate (green arrows).
Figure 23

Clean the backing plate with brake parts cleaner and apply a small amount of grease to the backing plate (green arrows).

Inspect the parking brake adjustment pawl and make sure you can thread it in and out for the parking brake adjustment.
Figure 24

Inspect the parking brake adjustment pawl and make sure you can thread it in and out for the parking brake adjustment.

Installation is the reverse of the removal steps.
Figure 25

Installation is the reverse of the removal steps. Assemble the parking brake shoes as pictured here and install the parking brake adjustment pawl in the shoes and use that spring to hold it together. Wrap the shoes around the hub flange. Use an old pair of dykes or needle nose pliers to insert the remaining parking brake shoe return spring. Insert the parking brake shoe mounting springs, push in and twist 90 degrees to lock them into the backing plate. Install the brake rotor, fastener and adjust the parking brake shoes. Install the brake caliper bracket, brake pads and brake caliper. Install the anti-rattle spring and the wheel and you should be good to go.

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