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Brakes

Tiny
SEAN03
  • MEMBER
  • 1992 CADILLAC DEVILLE
  • 135,000 MILES
I replaced my 2 rear wheel cylinders and I replaced my left front caliper because the bleeder screw broke. I bleed the brakes and everything was nice and tight. Now when I start the car the pedal goes to the floor. I called advanced and autozone and they said I have air in the lines or I have a leak. I checked for leaks nothing. I called napa and he said it is either the master cylinder the brake booster or the abs pump. With the car off when I pump the brakes it goes to the floor and does not build up pressure. Any suggestions. Thanks.
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Thursday, June 7th, 2012 AT 6:00 PM

9 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
If sure all air bleed out then seems master cylinder is faulty
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Thursday, June 7th, 2012 AT 6:18 PM
Tiny
SEAN03
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  • 523 POSTS
That's what I thought how would I know if the booster is broke
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Thursday, June 7th, 2012 AT 6:20 PM
Tiny
DOCFIXIT
  • MECHANIC
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Pedal would be VERY hard
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Thursday, June 7th, 2012 AT 6:24 PM
Tiny
SEAN03
  • MEMBER
  • 523 POSTS
Oh oksorry one more question. Could the brake booster check valve be bad. It has never been changed before. Thanks.
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Thursday, June 7th, 2012 AT 6:27 PM
Tiny
DOCFIXIT
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Then you would hear hissing and engine would die at idle
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Thursday, June 7th, 2012 AT 6:29 PM
Tiny
SEAN03
  • MEMBER
  • 523 POSTS
No it is the master cylinder then thanks for clarifying this up for me.
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Thursday, June 7th, 2012 AT 6:31 PM
Tiny
DOCFIXIT
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Try bleeding at master see if you get pedal and rear shose need to slightyl drag as drum is turned
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Thursday, June 7th, 2012 AT 6:35 PM
Tiny
SEAN03
  • MEMBER
  • 523 POSTS
I found out that the brake fluid cap the little rubber piece under the cap fell into it. I washed the inside of the master cylinder out. Is it still safe to use once the water dries up on the inside. Thanks
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Thursday, June 7th, 2012 AT 8:19 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Tes dry it real good
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Thursday, June 7th, 2012 AT 8:26 PM

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