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Pelican Technical Article:

Parking Brake Adjustment

Tom Morr

Time:

1 hour1 hr

Tab:

$0

Talent:

**

Tools:

Flat head screwdriver, ratchet/sockets

Applicable Models:

Mercedes-Benz R170 (1998-04)

Hot Tip:

Use a flashlight to help locate the parking brake adjusters through the wheel stud holes.

Performance Gain:

Rear tires won't move with parking-brake lever engaged

Complementary Modification:

Replace parking brake shoes if worn

Mis-adjusted parking brakes can result in a Mercedes-Benz rolling away under its own power. Owners who routinely park on hills should verify that the parking brake can hold the vehicle while it's in Neutral.

If your barking brake shoes are worn please see our spate article on replacing the parking brake's shoes. This article shows you how to adjusting the brakes to ensure proper contact inside the rotors as the parking brake's shoes wear.

The job is straightforward. Depending on wheel style, it can sometimes be done by removing one wheel stud per rear tire.

The process involves adjusting the shoes outward so they won't allow the wheels to spin by hand. Then the adjuster wheels are backed off 5-6 teeth to create the proper tolerance between the shoes and rotors. Finally, the hand lever's tension is checked and adjusted as necessary with the cable's adjuster screw.

You will need to safely raise and support the rear of the car. Please see our article on safely jacking up and supporting your vehicle

The car's rear must be raised and secured.
Figure 1

The car's rear must be raised and secured. Make sure the parking brake is disengaged (lever down) before beginning. The tire/wheel must be removed if the car has the light alloy wheels. Otherwise, the adjuster can be accessed by removing one wheel stud. We removed the caliper and rotor here to show the driver's side shoes and adjuster wheel. The manual specifies using a 4.5mm screwdriver to turn the adjusters.

The parking brake's shoes contact the rotors'
Figure 2

The parking brake's shoes contact the rotors' "hats." The shoes are expanded with the adjuster wheels until the rotor (or tire/wheel if still in place) can't be spun by hand. The adjuster wheels are located at approximately 1:00 on the driver's side and 11:00 on the passenger's side. To expand/apply the parking brake's shoes, turn the driver's side adjuster from top to bottom and the passenger's side from bottom to top.

Once the shoes grab with enough force that the rotor can't be spun by hand, the adjuster wheels are backed off 5-6 teeth clicks to create the proper tolerance.
Figure 3

Once the shoes grab with enough force that the rotor can't be spun by hand, the adjuster wheels are backed off 5-6 teeth clicks to create the proper tolerance. Both wheels should be adjusted the same number of teeth.

The manual specifies that the cable be adjusted so that 90-120 Nm of force are required to move the lever one click.
Figure 4

The manual specifies that the cable be adjusted so that 90-120 Nm of force are required to move the lever one click.

The parking brake cable adjuster is bolted to the floor pan in front of the rear differential.
Figure 5

The parking brake cable adjuster is bolted to the floor pan in front of the rear differential. Turning the adjuster screw in (clockwise) increases the tension to the hand lever.

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Comments and Suggestions:
Keokai Comments: Hi guys,

What's the best way to access the parking break cable adjuster bolt. I can't seem to find it. Is it in the boot and if so where. Or can I access it once the wheels are off....I've had a look but it does not look like it does in the picture.

I'm sorry if it's a stupid question but I'm very new to working on cars and this is a great project for me.

Advice is very much appreciated.

Thanks
May 4, 2016
  Followup from the Pelican Staff: See figure 5. - Nick at Pelican Parts  
Doc H Comments: My wheels turn freely but when I put it in reverse and try to backup the emergency brake locks immediately
February 22, 2016
  Followup from the Pelican Staff: What type of vehicle? I would assume the hold down springs are faulty. - Nick at Pelican Parts  
joy Comments: hey im doing a 2001 slk320 benz accelerator sensor pedal changing do you got any instruction on it how to install it.
January 27, 2016
  Followup from the Pelican Staff:
We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 

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