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post #6 of 8 (permalink) Old 8th January 2014
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Re: brakes failing on first use

Any garage should be able to have a look at this for you.

Normally if the servo fails or has an air leak the brakes still work as normal but the pedal is a lot harder to press.

As your pedal is going straight to the floor on the 1st use it doesn't sound like it's a servo fault, but you never know without seeing the problem in real life so to speak.

Changing the master cylinder / servo requires the full braking system to be blead through.

>>>THIS<<< explains how to test the servo (brake booster as its also know)

If you have a look on the web there will be instruction on how to change a master cylinder or servo somewhere, maybe for a different vehicle but the principal is the same.


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post #7 of 8 (permalink) Old 8th January 2014
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Re: brakes failing on first use

Hissing sound could be leaking pipe and an easy fix but you'll need to check it over
A length of pipe as a stethoscope can be a useful diagnostic tool
On quotes diagnostics, Renault will charge and likely quote a fortune, national franchises similar, little garages or brake specialists probably best. Phone around or visit a few
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post #8 of 8 (permalink) Old 10th January 2014
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Re: brakes failing on first use

lots of cars where the servo is mounted directly behind the pedals have a slight hissing sound if you listen carefully for it... lots of people don't notice it until they have a problem and are deliberately listening for noises.

It makes the noise when pressing the pedal only due to the vacuum being depleted.

It does not stay under vacuum which is why when the engine is off after a few presses of the pedal the vacuum is depleted and the pedal hardens up.

It does not sound like a servo problem, because stated opposite happens.. pedal firms up.

Fact it goes to the floor indicates possibly a leak on the system somewhere or the master cylinder.

Do a visual check around the calipers/wheel cylinders and hoses for any obvious leaks.
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