Question about 2002 Mercury Mountaineer
Your master cylinder is leaking past the piston inside the master cylinder. DO NOT DRIVE YOUR CAR ANY FURTHER. If you can complete the repair yourself, great. If not call for a flatbed tow truck to get you to a shop. You do not want to run into another vehicle because the brakes don't work the next time you try and apply them. Your brake light should be on in the dash now. It should come on when it senses an uneven line pressure in the hydraulic system. The master cylinder will need to be replaced, or rebuilt with a kit and then the entire system bled.
Posted on Apr 25, 2012
If your brake lights will not turn off, check it this way-Pull UP on the brake pedal. If the lights go off, you need to adjust the stop light switch, which is mounted on the upper brake pedal (it has an electrical plug in attached to it)
Posted on Mar 30, 2010
If there is no external leaks, I am willing to bet that your master cylinder is at fault. The seals inside the master cylinder can go bad, and let fluid past one-another, reducing its hydraulic pressure to apply the brakes. If you replace it yourself, read the bleeding procedure!
Posted on Jan 31, 2012
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