1991 GMC Sonoma Logo
Posted on May 16, 2010
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Parking brake light flashing in dash. what does this mean?

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  • Master 4,669 Answers
  • Posted on May 17, 2010
Anonymous
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You have problem with your Rear Anti lock brakes. It has a code in the system. Try reseting the system. Unplug the black box next to the master cylinder for about a minute and plug it back in. Start it back up and see if the brake light is still flashing. If it is I'll post how to check it for codes.

  • devyn donahue May 17, 2016

    I am having the same issues with my 91 sonoma. It flashes 5 short 1 long. It just started 2 days ago

  • devyn donahue May 17, 2016

    I am having the same issues with my 91 sonoma. It flashes 5 short 1 long. It just started 2 days ago

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Usually this means one of two things. Your parking brake is still applied and your shifter is not in park...or, your parking brake is not fully retracted and not touching it's fully retracted limit switch. Cycle your parking brake several times with the vehicle off. When you release it let it disengage fully. Start the vehicle and put it in gear but don't travel (foot on regular brake). If your parking brake is fully disengaged then your dash light for the parking brake should be extinguished. If you STILL have this problem then your limit switch needs to be adjusted or replaced.
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