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Brakes suddenly go to the floor in my 1998 Cabrio automatic. Is it the brake booster? Brake lines? did I lose a pad?

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Chances are that you have a leak somewhere. You need to get under there and look. If there aren't any leaks then likely the brake master cylinder is internally bypassing (fluid going around the internal seals) and needs to be replaced. Check the fluid level in the master first....If it's low, look for leaks, beginning at the rear of the master where it attaches to the booster and working your way down through the system from there.

Posted on May 16, 2010

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Brake leak need to fine how to fix and what bolts to use and hose/ Buick 1995 or 96 shylark found leak but bolt at fire wall is rusted and need to ss what size and how to,,, thanks Chief

Posted on Jun 23, 2010

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You changed the master cylinder and vacuum booster and have no leaks anywhere, but did you bleed the entire brake system after you did this work? A little bit of air in any of the lines will make the brakes ineffective.

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Are you losing any Brake Fluid? Is it visible anywhere at the four wheels? Is it visible anywhere else?
The Master Cylinder may be defective. When you bled the Brakes did you maintain proper Brake Fluid Level in the Master Cylinder? If you didn't: and air entered into the Master Cylinder there maybe air within in the system in the Master Cylinder. You can bleed the Master Cylinder by removing the brake lines, adding more fluid, pumping the brakes, bleeding the air out of the system.
Are you losing Brake Fluid and can't find a noticeable leak? Then there is a good posibility that the rear seal in the Master Cylinder is leaking and the Fluid is going into the Brake Booster - which is the large wheel shaped drum located on the fire wall. In this case both the Brake Booster and the Master Cylinder will have to be removed and replaced. The Booster contains seals that Brake Fluid is very caustic to and will ruin these seals- causing future failures.
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