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Brake pedal goes to the floor when stopping

Tiny
M JACKSON
  • MEMBER
  • 2010 KIA SEDONA
  • 6 CYL
  • AUTOMATIC
  • 126,000 MILES
Brake pedal goes to the floor when stopping. Master cylinder has been replaced and pedal still goes to the floor.
Sunday, April 1st, 2018 AT 2:55 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

Make sure you check for leaks. A line or brake hose that is not holding pressure can cause this issue.

Air is also a possibility. The master cylinder needs to be bench bled prior to installation. Once mounted on the car, the entire system needs to be bled to get rid of air.

What has been done?

Roy
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Sunday, April 1st, 2018 AT 4:55 AM
Tiny
M JACKSON
  • MEMBER
  • 2 POSTS
They replaced master cylinder and said they were looking for air in lines but could not find it. I have had it to three places and it is now worse than before they replaced cylinder. Car will stop but pedal is all the way down. Thank you for your advice. It is very frustrating.
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Sunday, April 1st, 2018 AT 6:50 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

You need a shop with a pressure bleeder, not a vacuum bleeder or gravity bleed.

That is the reason most shops cannot successfully bleed all the air out of the systems.

Roy
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Sunday, April 1st, 2018 AT 7:07 AM

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