Question about 2003 Jaguar X-Type
The problem you are describing sounds like the master cylinder. Usually the brake pedal is hard when the vacuum booster goes bad. It would feel the same whether the engine is running or not since there would be a vacuum problem and vacuum is provided by the engine. When the pedal is fading it's usually a problem with a seal inside of the master cylinder. When you replace it, save yourself some time and bench bleed it. Fill it with fluid, and if equipped, which rebuilt ones usually are, screw in the plastic fitting lines and run the open ends back into the reservoir and pump the actuator until the bubbles stop. Bolt it to the vehicle and start the lines. Have someone press the pedal, and while all the way down hold it there. Snug the lines up and have them release the pedal. Have them press it to the floor again and hold it there. Loosen the lines slowly to let what little air remains out, tighten them, and then have them release the pedal. That will rhymes with duck but starts with "s" (avoiding censorship) the remaining air out the top instead of bleeding the entire system from the wheels and pushing the air all the way through them. Please rate my assistance and leave a testimonial.
Posted on Dec 28, 2010
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Posted on Jan 02, 2017
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