Question about 2003 Audi TT

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1988 Lincoln TC message center says "Brake Pressure"

The brakes are spongy but will pump up. Vac boost appears to be working because after bleeding down the vac, pressing the brake and starting the engine, the pedal drops slightly.

There is no explanation in the owner's manual as to what this warning really means. I am suspecting the master brake cylinder, but am also concerned it may be the distribution valve or the vac boost. Is there a way to know for sure? The brakes were getting spongy, but the message didn't appear until after I replaced the rear brakes.

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  • msasteel May 22, 2009

    I really appreciate the response, but unfortunately it is too late. The problem was that the rear wheel cylinder apparently was sucking air when the brake was released, but sealed when pressed so it was spongy without any leaks being detected. This caused excessive air to build up in spite of my numerous bleeding attempts. I found it when the seal finally started leaking. I replaced the cylinder and all is well. Thanks for tryng, though.

  • gerry bissi May 11, 2010

    this is a hydraulic issue, not vacuum issue

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If the pedal keeps dropping the master cylinder is probably going bad (most common). Another tip is the rear brake pads hold the pedal height. Check your rear pads to see if they are low or need replacing. Most brake shops do a free inspection so I would let them do the leg work for you. Go to a reputable shop or if unsure get multiple estimates before performing the work

Posted on Aug 09, 2009

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