Hello! Fairly new member, since July 2017. My mother has a 2008 S40 2.4i in Texas with only 36,000 miles on it (a cream puff). I noticed that the brake booster pump stays on after shutdown. I have checked all the forums and this is not a new topic; it sounds like the brake booster switch is getting stuck. Fortunately, I have noticed it before it burns up the pump and blows the fuse like others have experienced. However, when I check for parts for a 2008 non-turbo, I don't see a brake booster switch listed on parts sites. I see switches available for earlier S40s (<2004) and T5 models. I also looked around the battery box (have not removed yet) but don't see anything like the switches I have seen for earlier model S40's. I would like to buy the parts before I tear into it so I don't have to do it twice. Can someone please confirm that a 2008 non-turbo S40 actually has a brake vacuum switch like the earlier model S40s and the turbos? If so, any idea what the part number is? Is it in fact, behind the battery box? Thanks a bunch!

 

look for something that looks like this:


[IMG]https://cimg9.ibsrv.net/gimg/volvoforums.com-vbulletin/349x330/80-image_84817e8b4934c08f6e01f0ce21aa3191adb63ed2.png[/IMG

Check Youtube for some vids (other Volvo models will be similar)

 

Should be on the brake booster drum.Common problem with this is that the cap lets go due to the week locking pin design and the switch always sends signal to the booster.

 

Thanks. It has been in the teens this week so have not had a chance to look. Temp is coming up this weekend, I will try to find it.

 

I got into it this morning and removed the battery box, GerBeGurGya was right in that it is mounted directly into the Booster drum. I was looking for an inline switch. Also, the reason I could not find it on any parts sites is because it is not called a switch, it is part of the vacuum line. Looks like the P/N is 31406272 or 31201433, they both are listed and pic attached. Doesn't look like it will be hard to change it..., just one more question. Does the switch just press into the booster drum? So to remove it, do I just tug on it?




Vacuum line with integral switch

 

Yes its inserted into the hole with rubber grommet to seal it off.Twist it left and right while pulling.

 

Thanks! Will order the part and change it out.