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How to Adjust Brake Pedal Height in a GMC Sierra

by Contributor

In a heavy duty pickup such as the GMC Sierra, your braking system should be in good working order. Though the GMC Sierra is widely praised for having a stiff, responsive brake pedal, you may need to adjust the pedal height. Depending on the severity of the problem, you may be able to adjust the height yourself in a few minutes.

Step 1

Get a GMC Sierra owner's manual and check the brake lines for leaks. If the brake lines are still intact and not leaking, proceed with adjusting the pedal height.

Step 2

Locate the brake booster rod, at the top and rear of the brake pedal lever. It's a thin rod running approximately perpendicular to the lever, with a lock nut at either end. The best way to access it is from the right hand side.

Step 3

Loosen the adjuster nut, which is closest to the brake pedal lever. If you can't find the appropriate size wrench, an adjustable crescent wrench will work.

Step 4

Raise the pedal height by twisting the booster rod clockwise, with a pair of pliers. Don't raise it too high, or you may cause further brake problems. To loosen, twist counter clockwise.

Step 5

Tighten the lock nut. Test your adjustment out. You should have a small amount of free play, but you shouldn't notice any brake chatter or unusual sounds.

Contact a GMC mechanic if your brake pedal remains unresponsive.

Tip

  • This article is for adjusting pedal height, not fixing any larger problems which may be causing low pedal height.

Items you will need

  • GMC Sierra repair manual
  • Crescent wrench
  • Pliers

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