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Home >  Video > How to Replace the Rear Drum Brake Wheel Cylinder on a 1986 GMC Jimmy

How to Replace the Rear Drum Brake Wheel Cylinder on a 1986 GMC Jimmy

Video Summary

1A Auto shows you how to repair, fix, change or replace a worn, squeaky, fading old rear drum brake wheel cylinder on a 1986 GMC Jimmy. You will first learn how to remove your existing rear drum brake wheel cylinder, and then how to install a replacement.

GMC Jimmy Wheel Cylinder

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Tools Needed:

  • Multiple size wrenches (may vary depending on make and model)
  • Pliers
  • Assistant for bleeding brakes

Repair Steps:

  1. Remove rear wheel and brake drum.
  2. Remove brake shoes. It may be helpful to remove both wheels and drums at the same time but leave one side of brakes together to use as a reference when reinstalling brakes on other side. Or take a digital photo to refer to.
  3. Remove brake line from the back of the wheel cylinder with wrench. Make sure you do not twist the brake line or you will need to replace that as well.
  4. Remove the two small bolts holding the wheel cylinder to the backing plate, and pull the wheel cylinder up and out. Keep the plungers from the old cylinder as most new ones do not come with these.
  5. To install the new wheel cylinder, put it back in partway and start brakeline nut by hand first, then push cylinder all the way in and reinstall bolts. Tighten brakeline nut and bolts with correct size wrench.
  6. Reinstall brakes referring to other side of vehicle or digital photo. Reinstall brake drum.
  7. You will need two people to properly bleed the brakes. It is a good idea to bleed the fluid from all four corners of the vehicle at this time.
  8. Reinstall tire and take car out for a road test. To begin the road test first put foot on brake as you shift car into gear to make sure the brakes hold the car when idling. Then begin moving slowly and checking the brakes before taking the vehicle on the road.

That is how to replace a rear drum brake wheel cylinder that needs to be changed on a 1986 GMC Jimmy. Thanks for watching! Please feel free to call us toll free 888-844-3393 with any questions or to order any of the parts shown in this video, or you can order online right here at 1AAuto.com.

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