Question about 2003 Renault 181

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Brakes For some time there has been a slight hissing from brake pedal area. On tapping pedal it would stop. Now hissing very loud and does not stop when tapping pedal. Please can you advise Sue Bayly

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  • bayly47 Jun 25, 2008

    Many thanks for your helpful reply. I have taken the car to a local garage and he has diagnosed the brake servo as the problem. Not sure if that is the correct spelling. Does this seem logical to you?

    Thanks,

    Sue

  • Anonymous Mar 27, 2014

    I have a 1995 C 1500 v8 and when I press the brake pedal I hear a loud hissing sound. Its harder to push the brake pedal to stop the truck. What is goingon?

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  • 19,396 Answers

Hissing or scratching sound is usually related to consumed brake pads/ shoes or deformed disks.
Usually you fix it by replacing brake pads, in some case you also need to change the disk, but this is less frequent, and happens when you keep circulating with consumed brake pads for many miles.
If you have a vehicle with brake shoes instead, you need to replace and calibrate brake shoes .

Posted on Jun 22, 2008

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1 Answer

When I press the break and then release there is an air leak sound. What is the cause?


The brake servo or booster is divided into two chambers separated by a flexible diaphragm. Briefly there is vacuum on one side and pressing the brake pedal allows air to enter the other side and this is how the brake pedal effort is boosted.

The air enters via a filter through which the pushrod connected to the brake pedal passes. When the brake is applied the hiss of air entering the chamber will be audible; more on some models than others.
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