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Discussion Starter · #1 ·
2001 V70XC. When letting off brake pedal, makes air hissing sound. Sometimes continues sounding like an air leak when stopped and have to tap pedal several times to stop. DIY fix? What's the part?
 

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Re: Brake pedal goes phissssssst (TWMn)

Sounds like a Brake Master Cylinder. Don't know your level of expertise so, maybe DIY, maybe not.<p> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/cool.gif" BORDER="0">
 

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Re: Brake pedal goes phissssssst (TWMn)

maybe the brake booster. sounds like a vaccum leak. the 'check valve' for the booster also may be a source. check all the vaccum lines. the hoses may be leaking.<p>just a guess. i have had all of these things happen on other cars that i have had.<p>good luck.
 

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Re: Brake pedal goes phissssssst (hastee)

Booster, common issue with 2001's.<br>Not cheap, $600 to $800 (retail)
 

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Re: Brake pedal goes phissssssst (JRL)

yep, that is my best guess. i liked the days when volvo had replacement parts for the booster. i could get the seal for the actuator rod (the rod that pushes on the master cylinder), and some girling grease for it and do the most common fix of it for about 5 bucks. the check valve was about 7 or 10. today i checked for the booster at myswedishparts and the dam booster was about 700!<p>
 

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Discussion Starter · #6 ·
Re: Brake pedal goes phissssssst (JRL)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>JRL</b> »</i></TD></TR><TR><TD CLASS="quote">Booster, common issue with 2001's.<br>Not cheap, $600 to $800 (retail)</TD></TR></TABLE><p>Thx. Yeah, that's what I discovered. Found this:<p><A HREF="http://volvospeed.com/vs_forum/index...T&f=34&t=24340" TARGET="_blank">http://volvospeed.com/vs_forum...24340</A><p>So, does the whole booster need replacing or since the sound is coming from under the dash, is there just a seal (the black one mentioned in the post link above) that can be replaced to stop the air leak?
 

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Discussion Starter · #7 ·
Re: Brake pedal goes phissssssst (hastee)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>hastee</b> »</i></TD></TR><TR><TD CLASS="quote">yep, that is my best guess. i liked the days when volvo had replacement parts for the booster. i could get the seal for the actuator rod (the rod that pushes on the master cylinder), and some girling grease for it and do the most common fix of it for about 5 bucks. the check valve was about 7 or 10. today i checked for the booster at myswedishparts and the dam booster was about 700!</TD></TR></TABLE><p>So, I take it from your post, that parts (seals) are not available? Found this, rebuilt for $184.<p><A HREF="http://www.autopartswarehouse.com/search/?N=11879+1733+4294965184+5750" TARGET="_blank">http://www.autopartswarehouse....+5750</A>
 

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Re: Brake pedal goes phissssssst (TWMn)

i am sure they are available somewhere. volvo does not make this stuff easy, but probably many cars use the same booster. like brake pads there are only so many reasons to have much difference. i once rebuilt my master cylinder for a volvo 145s out of a parts house in grand junction colorado using an international scout rebuild kit along with a chevy kit. edit; that cost 11 bucks.<p>in that car it used wheel bearings from a chevy. the valve train lifters were from a small block chevy too! edit; the clutch was the same as a 6 cyl ford mustang! go figure.<p>the only reason i ever found to do the whole booster was when the diaphram split, or the housing was leaking. the seals on both sides of the booster split, go dry (need grease) then leak. for the do it yourselfer volvo sucks. but with some ingenuity i bet rebuilding these is possible. ala the available 'rebuilt' booster available.<p>you could try the rebuilt booster then take the origional apart to see what size seals they are and do that one.<p>best of luck
 
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