Hissing Brake Pedal - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 8 (permalink) Old 12-14-2008, 03:48 PM Thread Starter
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Hissing Brake Pedal

Hey all,
I went out to my 2000 intrepid this morning to go to work and when I started the car a horrible hissing sound was coming out from under the dash by the brake pedal. When I depress the pedal it would go in and out of hissing, when released completely the hissing would continue, its fairly loud. Suffice to say I found another conveyance to work until I can figure out what exactly is wrong. I did some research and found that it could be the brake booster, hopefully its just a leak in a vacuum line? Dont have the funds to throw down for a new booster!! And do you think it is safe to drive for now until I can figure out for sure what the deal is? Oh and this is the first incidence of this happening, and freezing weather just moved through last night (snow, ice, etc), not sure if a line could have froze or not???
Thanks all
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post #2 of 8 (permalink) Old 12-14-2008, 04:50 PM
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I recently got a booster from the junkyard for $15. It is in good condition aas I checked the vacuum in it beforehand. I am still driving mine with the old booster in because I havent been able to put this new one in yet. I would just check as many lines as you can. I would venture to guess it is the booster though.
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post #3 of 8 (permalink) Old 12-19-2008, 01:08 PM
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I would have no problems trusting the braking system with a vacuum or booster problem.

The mechanical part is still intact. Worst case you may loose the assist.
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post #4 of 8 (permalink) Old 02-05-2009, 11:50 AM
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I have recently and even this morning (18 F) had exactly the same problem and only when it's extremely cold outside (less than 25 F). It does not happen all the time when it's cold, but it has happened after a signifcant rain or snow event and when it's cold. As soon as the interior warms up (generally <10 minutes) the sound is gone and all seems fine even though it still quite cold outside .

I thought that it behaved like there was ice in the line somewhere (even sounded like it the first time it happened, like all of a sudden the ice "let go" and pedal responded as normal and the hissing sound suddenly stopped right in the middle of applying the brakes. Of course, it took a little longer than 10 minutes for this to stop the first time as it was 10 F outside).
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post #5 of 8 (permalink) Old 02-05-2009, 01:19 PM
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This was my experience as well with my '99 LHS. There must be something mechanical going on because I have never experienced it with my '99 Intrepid, but I never experienced any braking problems, and I never "fixed" it. I would only notice it when it was very cold, and it would go away after it warmed up.
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post #6 of 8 (permalink) Old 02-05-2009, 11:59 PM
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I have seen from other posts that water tend to accumulate in the boolster. So cold + water causes problems... some people even wondered whether it is possible to take the boolster out and dump all the water out and see if that fix the problem. Claim: don't quote me on any of this . I'm just passing some info...
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post #7 of 8 (permalink) Old 02-06-2009, 11:40 AM
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Thanks! I may try that this weekend since it will be warm again. BTW, this morning it was 18F and not a sound as I drove away. The pattern continues.
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post #8 of 8 (permalink) Old 02-06-2009, 01:41 PM
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Well from my experience, after driving around it got worse for me, eventually it got harder and harder to stop. The hissing went away a couple of times but I had to make an abrupt stop once and I almost didn't stop in time. So hopefully its the vac lines for you but if it is the booster, change it ASAP. It may mess your pads and rotors up also from trying to brake so hard. Also a very hard removal and install process, if you are gonna do it yourself, dont make any plans for the day.
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