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Old 02-24-2009, 01:42 PM   #1
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Sucking/Hissing sound from brake pedal?

Hey, has anyone seen this? I've got a soft sucking/hissing sound coming from my brake pedal. It only occurs when the pedal is pressed in, but not held all the way in. If I let my foot off a bit, but still press the pedal, I get the noise. It will go away only when I let off, or if I push the pedal all the way in and hold it firmly. I want to say, I only just heard it when it has gotten really cold out last nite. I never noticed it before that.

I'm guessing I have a bad seal somewhere. Gonna do some digging around, but thought I'd ask first.

Thanks


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Old 02-24-2009, 01:55 PM   #2
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Sounds like your master vac (the brake booster) has sprung a leak. Not a very common problem, and not usually fixable without a whole new unit. And I'm not sure how hard a job it will be on your model.....usually not too bad however.

good luck....
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Old 02-24-2009, 02:13 PM   #3
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Question for the original poster, do you get the flickering parking brake light? That's one way to tell that your Master cylinder needs replacing.
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Old 02-24-2009, 02:48 PM   #4
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no flickering dash lights or any other type of warning. don't even notice the engine idle drop or surge, which i've seen before with a vacuum leak. it looks like i'm gonna be busy tonite, but i'll try to poke around and see what's going on.
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Old 02-24-2009, 02:49 PM   #5
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Moved to "Ford Focus Technical Chat".
Definitely sounds like a leaky (vacuum) booster to me.

It's not common on the SVTF yet, but the more miles we all rack up, the more often we'll hear of this I'll bet.
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Old 02-24-2009, 03:11 PM   #6
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OK, so now I'm gonna ask...does anyone have a service manual for these? I'm guessing there may be one linked here in the forum. Awesome, I bought the car to save $$. Now I'm gonna have to spend some. :(

I'm guessing the brake pedal has a plunger that a seal might be leaking on? Maybe I'll see if I can find some silicone lubricant and see if it will "seal" the seal. :)
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Old 02-24-2009, 03:32 PM   #7
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Don't bother trying to fix it.
I've had them go out before, and it's virtually impossible to repair.
Usually, it's the internal bladder that starts leaking.

The price of a new one and the effort to install it is well worth the piece of mind knowing it's going to work right.
IMHO, that's too important of a "safety" piece to be left to chance.

There aren't any manuals on this site, other than links to Owners Manuals or the SVT Supplement.
And, neither of those will help with this maintenance issue.
There are CD's available (Ebay?) with "electronic" factory repair manuals.
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Old 02-24-2009, 03:50 PM   #8
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Ahem, look down. I don't remember what is all in my links but may be something helpful.
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Old 02-24-2009, 06:41 PM   #9
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So all the way home today, it doesn't make a noise. I'm guessing it was due to the cold. I didn't see a diagram of the brake pedal linkage/master cylinder in any of the links in your sig. I guess I'll keep a check on it, and if it gets more noticeable I'll have to fix it.
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