BRAKES

  • Tiny
  • sean03
  • 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
  • Expert
  • 18,993 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
  • Member

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
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Pedal would be VERY hard

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Thursday, June 7th, 2012 AT 6:24 PM
  • Tiny
  • sean03
  • Member

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

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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  • 18,993 posts

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

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
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  • 18,993 posts

Tes dry it real good

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Thursday, June 7th, 2012 AT 8:26 PM

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