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Air-leak (hissing) sound when depressing the brakes pedal

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linus:
There is a hissing sound when i press hard on the brakes (when engine is on and off).  Is this normal?  I went to TC for servicing today and raised the issue.  The engineer said this is normal... but I did not notice such sounds before.  Anyone can advise?

jonpaul0104:

--- Quote from: linus on September 23, 2011, 10:14:42 PM ---There is a hissing sound when i press hard on the brakes (when engine is on and off).  Is this normal?  I went to TC for servicing today and raised the issue.  The engineer said this is normal... but I did not notice such sounds before.  Anyone can advise?

--- End quote ---

think it is the hydraulic at work.....same hiss hiss hiss sound when u repeatedly pump the brakes....

jasonkstan:
It could be the Brake Booster vacuum leaking.  Do you feel need to step harder on the brake to stop the car than before the "hissing" sound started ? :(

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