2006 V70 brake Vacuum pump/switch 31317445 31265825 Topic is solved

[lonestar245]

Nope. Not on the S80

I have a 2002 S80 non-turbo and it has a vacuum pump. I suspect the Turbo models have to have some alternative vacuum source since the turbo engine never produces engine vacuum due to the turbo creating positive pressure in the manifold.

[537playing]

I'm not sure about the turbo models. My turbo S60 does have this pump but my non turbo 2001 does not have one.

[oragex]

I wonder what model year are affected with this issue? And does it happen at higher miles? I have a 2003 non turbo with 100k miles, makes me worried..

[elmarconi]

I just did this repair and the partnumber isn't unique.

30645454 or 31317445 or 31317525 are all ok.
In fact it is a Hella 009428081 aka Hella UP28.
These are fitted in a lot of vehicles. Volvo/VW/Subaru/Peugeot. They will all fit.
A little Ebay might save you some bucks...

[davidfcole]

BETTER, EXACT part on Amazon: ACDelco 20997418 GM Original Equipment Power Brake Booster Pump Assembly, I paid $60, but now lists for $88. both made by Buhler mfg, BTW, but sold as AD-Delco, Hella etc

[BadJuJu]

My understanding is that the brake vacuum pump shares a circuit with the O2 sensors, so that when it burns out the fuse, your emissions go down as well as the pump. My daughter's S40 is at the dealership now having the replacement of the pump and switch to the tune of $700+... For the record, I didn't know about the brake vacuum pump issue, but was troubleshooting both O2 sensors shooting failure codes. Her exhaust was foul smelling (as you'd expect) and I was hoping it was something besides both sensors, which failed at the same time. The tech called and said the oxygen sensors were most likely fine, that the brake pump was the culprit. We'll see tomorrow when I pick it up.

[vtl]

Why you measure DC voltage and say it's an impedance? Impedance is a reactive force to alternating current.

[johnljoseph]

Nope. Not on the S80

My S80 (2005 2.5t) has one. I am diagnosing it today. I have this problem. Only on cold starts.

[johnljoseph]

Excellent write-up. I just did this on my '07 XC70, and everything (including part numbers) is the same. One thing I did differently -- on step 5, you can see in the picture that the bracket that the air box attaches to has U-shaped slots where the left two clips attach. This means you can save a lot of yanking on the air box. Pull out the clip on the right side and then just slide the air box to the left to remove it. It slides back in easily when replacing it.

A way that I have always handled this here and with any of these types of plastic connectors, is to get a small socket and put it on my "socket driver" (its a handle that a socket snaps to) and just press the socket down over the plastic prongs. As long as it is smaller than the prongs, it will pull them together and the box just lifts off

[johnljoseph]

Well, I just checked the switch like Dan777 instructed and the switch is good. Then I unplugged the vacuum line from the auxiliary pump and the right side line to the brakes so there would be low vacuum and put the switch in the number II position and there was no vacuum. Then I unplugged the pump and checked the contacts to it, there was voltage. So... the pump is definitely shot and the switch is definitely good. I was hoping it was the other way around. That pump is pricey....

Thanks Dan777 for such a useful writeup. It helped.

-John