Question about 2003 Jaguar X-Type

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Dear, i have a problem with brakes. When i do press pedal on first pressing car is stopping, but if i do press pedal several time quickly pedal is becoming hard after pressing, and take 1-2 seconds pedal to take effect and stop the vehicle. We changed vacuum device, we changed vacuum pump, as well as central brake system, but nothing has changed. Please assist/help as here in Serbia we do not have an authorized Jaguar dealer to fix this problem. Please help. Thank you. Stevan 00381646166827 (mobile number)

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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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2 Answers

How do you know that a brake booster is bad?

Booster problems are rare but they do go bad sometimes.
A bad booster generally causes the brake pedal to feel hard to push down, and a lot of pressure on the brake pedal is required to make the car stop.
Rarely, a vacuum brake booster will develop a vacuum leak, which can cause engine performance problems, hissing or whistling noise, as well as requiring increased pressure on the brake pedal to stop.

The first test:
With the vehicle parked, turned OFF, and the parking brake set, pump the brake pedal 5 to 6 times. If the pedal gets harder to push after several times, your booster is probably good.

The second test (To make sure):
After the test above, without making any changes, press and hold the brake pedal with light to moderate pressure.
Now with your foot still on the brake pedal, start the vehicle.
If the booster is good, you will feel the pedal go down when the engine starts.

Hope this helps!

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Brake pedal drops very low on first press only

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Not sure if you have done all this.


Functional test:
1. With the engine stopped, Depress the brake pedal several times, then depress the pedal hard and hold that pressure for 15 seconds. If the pedal sinks, the master cylinder, brake line or a brake caliper is faulty
2. Start the engine with the pedal depressed. If the pedal sinks slightly, the vacuum booster is working. If the pedal height does not vary, the booster or the check valve is faulty

Leak Test:
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Check valve test:
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2004 chevy venture will not shift from park. The engine is running and the brake pedal is pressed.

The blocking bracket might be jammed. Stop the engine, nudge the car a little and try again to move the lever without pressing the brake pedal. 
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Oct 04, 2009 | 2004 Chevrolet Venture Passanger

1 Answer

Have to press hard on breaks to break on 528i bmw 2000

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if pedal doesnt go down when engine is running booster has leak or no vacuum supply from engine which requires great pedal effort to try and get vehicle to stop.

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