Brake pedal goes to floor can be pumped up until firm

Tiny
STANOTECH
  • MEMBER
  • 2013 AUDI A8
  • 3.0L
  • 6 CYL
  • AUTOMATIC
  • 113,711 MILES
Brake pedal goes to floor can be pumped up until firm pedal is required again. After letting sit for a while the pedal will go straight to the floor. I have bled with pump and by hand replaced master cylinder cannot find any leaks in brake fluid system.
Friday, April 5th, 2019 AT 9:53 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Sounds like you still have air in the system.

You should get a pressure bleeder that will force all the air out with air pressure into the master cylinder.

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Roy
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Friday, April 5th, 2019 AT 10:49 AM
Tiny
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I used the Mac tool pressure bleed that you out reservoir on top of mast cylinder reservoir then hook to each bleeder at a time pull trigger until it sucks straight fluid. Did this procedure twice. Pads were changed recently by someone else then this problem occurred With vehicle cranked pedal goes to floor can be pumped up but bleeds off and goes to floor when held down.
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Friday, April 5th, 2019 AT 10:52 AM
Tiny
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That is a vacuum bleeder not a pressure bleeder.

This is done with air pressure applied to the master fill cap and then forces the fluid out of the system at each wheel.

Roy
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Friday, April 5th, 2019 AT 10:55 AM
Tiny
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Sorry didn't process your reply properly I understand what you mean. I will find one and do it that way. I will reply back when complete.
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Friday, April 5th, 2019 AT 10:59 AM
Tiny
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Sounds like a plan.

Roy
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Friday, April 5th, 2019 AT 11:08 AM

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