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Pelican Technical Article:

Parking Brake Adjustment

Steve Vernon

Time:

1 hour1 hr

Tab:

$0

Talent:

*

Tools:

Long flathead screwdriver, 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)

Hot Tip:

Make sure the parking brake is off

Performance Gain:

Car doesn't roll down hills

Complementary Modification:

Replace rear shoes and discs

If your parking brake is not functioning properly, and it is having a hard time holding the car in place, you may only need to adjust it rather than replace everything.

There is an adjustment mechanism between the parking brake shoes that can be set to compensate for the wearing of the parking brake shoes. To adjust this mechanism, you must first raise and support your vehicle. Please see our article on jacking up and supporting your W204 for more information. With the car safely supported remove the rear wheels. There is an adjuster on both rear wheels.

If you can not get the parking brakes to work with these adjustments then it is probably time to replace the shoes. Please see our article on replacing your parking brake shoes for more information.

You will need to rotate the disc or rotor until one of the stud holes is at 2 o'clock for the driver side and 10 o'clock for the passenger side.
Figure 1

You will need to rotate the disc or rotor until one of the stud holes is at 2 o'clock for the driver side and 10 o'clock for the passenger side. You will need to shine a flashlight in the stud hole (red arrow) until you see the spindles on the adjusting mechanism. While you do not need to remove the rear rotors or discs to do this, you will be doing it "blind," as you cannot see the adjuster while working with it. The two parking brake shoes use the inside of the rotor as a brake drum. At the top of the two shoes is an adjuster that basically separates the shoes. It can be adjusted in or out by turning the spindled-wheel on the mechanism. Turn the rotor so one of the stud holes is at 2 o'clock for the driver side and 10 o'clock for the passenger side. If you look in with a flash light you will see a sprocket. You will need to turn this sprocket clockwise to expand the brake shoes. The best way to do this is to make sure the parking brake is off and try and turn the rotor by hand. You will want to adjust the tensioner until you can feel it grabbing the rotor. Once the shoes are grabbing the rotor, back off the adjustment so the rotor just spins freely. Now apply the parking brake, and you should be good. Make sure you do both wheels, so that you have maximum braking power and so the shoes wear evenly.

Here is what the adjusting mechanism looks like with the rotor off.
Figure 2

Here is what the adjusting mechanism looks like with the rotor off. You can see how the screwdriver enters through the stud hole and engages the spindles of the mechanism to turn it. You do not need to remove the rotor to perform this job though.


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Page last updated: Fri 12/9/2016 02:58:24 AM