Question about 2002 Chevrolet Avalanche

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My brakes are hard to push down and it sounds like air is coming out of the brake pedal

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  • Chevrolet Master
  • 2,019 Answers

This one I can be fairly certain of. It sounds like a rip in the vacuum power brake booster diaphram. Usually you just replace the whole power brake chamber, which includes the diaphram. You have to first remove the 2 bolts holding the master cylinder to the larger booster chamber, but you don't normally have to open any brake lines.
When replacing, make sure the brake pedal rod goes down the center of the new booster, and that there is sufficient clearance or freeplay in the pedal rod when done. (like .1" is all you need)
Should not have to bleed after done.

Posted on Jul 08, 2010

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  • Master
  • 3,092 Answers

That's the power brake booster, the seal has gone bad and don't hold vacuum, so no power brakes, unit ( power brake booster ) will have to be replace, there no repair for it but replacement.

Posted on Jul 08, 2010

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Posted on Jan 02, 2017

  • 102 Answers

SOURCE: Hard brake pedal while applying brakes

with the sound of air when applying the brakes, sounds like a bad power brake booster, located behind the master cylinder,large round peice

Posted on Jul 06, 2009

co7196
  • 3433 Answers

SOURCE: hard brake pedal hear air leaking when pedal pushed

When you press on the brake? Have your brake vacuum assist checked. It,s that bigspaceship looking thing between the brake master cylinder an firewall. good luck and be safe.

Posted on May 25, 2009

  • 112 Answers

SOURCE: when i step on the brake pedal i hear air coming

This perfectly describes a failure of the brake vacuum booster.
Replace the power brake vacuum booster.

Posted on Jul 20, 2009

  • 11 Answers

SOURCE: hard to push brake pedal down to stop.

1. Check brake fluid level and look for leaks in the brake lines and at the calipers.
2. Bleed the brake fluid completely and replace with fresh fluid (google search: how to bleed brakes). Then bleed air by having someone press the brake pedal 4-5 times, then press and hold while you open the bleed valve and close when fluid streams out. start with the rear wheel (if 4wheel disc brakes) then move to the front.
3. Replace Master Cylinder (sorry, but if 1 or 2 didn't fix it, this is the last option) This is usually over $150, and will involve step 2 again when completed.

Good luck, hope this helps.

Posted on Sep 29, 2009

txkjun
  • 409 Answers

SOURCE: brake pedal is hard to push and the car doesn't stop very well

Yes it could be the booster.

Posted on Dec 26, 2008

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