Question about 2002 GMC Sierra 2500HD

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How to adjust parking brake on a GMC Sierra 2500 HD Duramax 4wd?

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  • pwmsound Apr 13, 2009

    Thanks for the info. I did find the adjusters today. GM did a good job hiding them. I tightened them up until I got a little drag, but they still don't hold.



    Also noticed grease in the area, so you're probably correct about the seals. Will have to dig in deeper.

  • Anonymous Mar 13, 2014

    need headlight adjustment crew bracket for 2005 gmc 2500 sierra

  • Anonymous Mar 22, 2014

    this also duramax diesel. i replaced the power steering pump and completely flushed the system

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The adjuster is just like on a car with drum brakes. It can be adjusted with the wheels still on the truck, but if yours is out enough that it doesn't work, an inspection is warranted. Axle seal failure is common and will soak the shoes.

Jacked both rear wheels off ground, and while slowly spinning wheel, tighten the star-wheel adjuster until you just hear and feel brake drums rubbing, then loosened slightly.
There's a plastic dust cover about 1/4" X 1" that you remove, and use a drum brake adjuster tool.

The driverside access hole is below axle, easily accessable. To tighten driver side rear parking brake, turn star-wheel adjuster down.


The passengerside access hole is found above axle, and difficult to see. Removed pass side wheel and used an inspection mirror.
To tighten passenger side rear parking brake, turn star-wheel adjuster up.

Good luck and hope this helps. Oh and the other thing to is that if you do smell axle fluid around the wheels and see oil leaking from the drum area. Then you have a axle wheel seal and or bearing gone bad too.

Posted on Apr 13, 2009

  • Harvey N Tawatao
    Harvey N Tawatao Apr 14, 2009

    Sorry about the bad news on more work, but hey. It's not just our truck's. it's our hobby.

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Hello. I have the issue of the rear seals leaking, soaking the brake shoes. Lot's of fun. I see the star adjuster for the parking brake shoes, but do these auto adjust in reverse with Disc brakes? Also is it possible to install the adjusters backwards. I ended up with no parking brake and the shoes are hardly worn at all. I am replacing the seals and brake shoes as they were coated with oil.

Posted on Mar 29, 2010

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Hi: To my knowledge the rear brakes are self adjusting as the brake pedal assembly has a self adjusting cable mechanism built into it. One thing to try is to reverse the vehicle and pump the brakes, this should adjust the rear brakes if there is adjustment needed there. To test adjustment put on emergency brake.. put vehicle in drive and see if it moves forward while idling. Please rate suggestion... ty

Posted on May 22, 2009

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Posted on Jan 02, 2017

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Park Brake Adjustment



Park Brake Adjustment (Disc Brake)

Tools Required

j 21177-A Drum-to-Brake Shoe Clearance Gage

Park Brake Shoe Adjustment

Caution: Refer to Brake Dust Caution.

Important: The park brake shoes must be adjusted before the park brake cable tension is adjusted.Set the J 21177-A so it contacts the inside diameter of the rotor
  1. Position the J 21177-A over the shoe and the lining at the widest point.
  2. Turn the adjuster nut until the lining just contacts the J 21177-A. Park brake shoe to brake rotor clearance: 0.6604 mm (0.026 in)
  3. Repeat steps 1-3 for the opposite side.
Park Brake Cable Tension Adjustment

Important: Before you adjust the park brake cable tension, verify that the park brake shoes are adjusted to provide a clearance of 0.6604 mm (0.026 in) and the rear disc brake rotors are installed.

  1. Verify the self adjuster lock-out pin has been removed.
  2. Fully apply and release the park brake pedal 3 times.

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