2005 Mercury Mountaineer Brake Issues
I have a 2005 Mercury Mountaineer and replaced the brake pads. After I replaced the brakes I bled the brakes several times from rear passenger, rear driver, passenger, to driver side. I checked for breaks in the line and the pressure is solid until I turn on the ignition. After that it sinks to the floor, it is worse in drive than reverse but I am out of ideas.
I think you have a brake booster problem.
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