Question about Chrysler Imperial

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The brake peddle is very hard to push, it's like there is no booster? The peddle is not spunge at all, it's hard as a rock and I am a 275 lbs guy and it's difficult for me to get it to stop?

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Check if there is any difference in the feel of the pedal when the engine is running or the engine is stationary. If the feel and required pressure is the same, the booster is not working. Check the vacuum lines for cracks and leaks. If these are intact, the booster diaphragm might be leaking and the booster needs to be repaired or replaced. If there is a slight difference in feel, try replacing the brake fluid - empty the reservoir and refill it with fresh fluid and then bleed the brakes until new fluid is seen coming out of each bleed point. Remember to top up the reservoir regularly to prevent air getting into the system.

Posted on Apr 06, 2011

  • Hans Pearson
    Hans Pearson Apr 07, 2011

    I thought of one more thing to check the booster. With the engine runnning,press lightly on the brake pedal, until it just starts to give resistance, then switch the engine off. If the booster is working the pedal should sag away about 1/2" or so. If there is no movement there is a problem with the booster.

  • ranallog Apr 07, 2011

    I guessed it was the booster as well. is there anything special I do when replacing it?

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if the car is running ok we can rule out vacuum leaks so that leaves the check valve but with the car running even a check valve wont cause the concern

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