Brake booster?

2010 KIA FORTE
70,000 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC
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MIKEY301
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  • 1 POST
When I depress the brake pedal it make a sound like a muted horn. The sound comes from under the dash. The pedal goes almost to the floor, but can be pumped up. No lose of braking. I did replace the master cylinder because the brake fluid looked aerated. The problem was there before the replacement of master cylinder.

This is not normal brake sounds like rubbing/grind of brake pads.

Could this be a bad Power Brake Booster?
Nov 9, 2018 at 12:53 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,688 POSTS
It does sounds like the brake booster is bad. To be sure can you please shoot a quick video with your phone so we can hear the noise, that would be great? You can upload it here with your response. Here are diagrams to help you change out the booster below.

Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
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Nov 10, 2018 at 3:03 AM
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