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After depressing the brake pedal there is a hissing sound. is this normal or is it air in the line

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1999 Buick Century Custom _ Brake Problem My 99 Century has little to no assist and it makes an air hissing sound when depressing the brake pedal. I think that this means that I have a faulty brake...


nope you have to replace them.when brake booster diaphram leaks you cant plug them.i have bought one at salvage yard in good shape.until i got a new one.get your brake booster from inside salvage yard where they stock them inside out the weather.dont take any brake booster off old outside cars been in all kinds bad weather. there vacuum diaphram probably dried up will leak also.

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Air pressure sound when i push on the brakes


air pressure sound may come from a leaky vacuum hose or bad check valve at the booster or master cylinder.

But, I think that it's normal to hear a soft hissing sound when depressing the brake pedal which comes from hydraulic fluid going through the passage ways.

Is the pedal hard?

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Brake servo making a hissing sound around the brake pedal but


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Yoou most likely have a vacuum leak in the line from the booster to the intake. It could be a bad booster or check valve as well.
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air may have gotten into your brake lines. try bleeding your brakes. this will require two people

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Sounds like it could well be the brake servo unit.

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Hissing sound from brake pedal of Renault Scenic 2001


Hi,
From your description this appears to be a Brake servo issue.
The brakes are assisted by a vacuum created from the draw off the inlet manifold, it gives assistance too the brake pedal pressure by a large tank/cylinder mounted on the Bulkhead/firewall.
I feel that the sound you a hearing is air being draw into the Brake Servo from the foot pedal seal and the reason for fluctuation in the engine is the vacuum from the inlet manifold is being upset.
Attention I suspect should be addressed to the Brake servo/pedal seal or gaitor.
I hope this clarifies your thoughts?
Please remember to rate my effort.
Paul 'W'
Onyer~EDSon(:0) {#><U.K.

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