Brake Booster Vacuum Line Check Valve? (Pic)

[el bob]

I need a part, which I think is a check valve, that I found on an 89 325i and can't find on realoem for any year. I posted a picture of it on a thread in the wanted section and a helpful guy from Lithuania posted a part number for what he thinks might be it.

I don't have the ETK at work and my home laptop that had the ETK recently died. Could anyone look up this part number and see if it's the same piece as what's pictured below?

Part Number 34331156703 (posted by zygasbmw)


Muchos gracias'es

[jlevie]

You probably aren't looking in the correct place on realoem.com (or the ETK). The check valve in the section Engine->Vacuum Control. For example: http://www.realoem.com/bmw/showparts...61&hg=11&fg=45

[el bob]

Yeah, if you click the link you posted and look at the picture, you'll see item number 2 has two barbs on one side and one barb on the other.

The check valve picture above, and found on an 89 325i has a single barb on either side. (two opening instead of three). I need the one pictured above.

Thanks for the help though.

[DSP74]

Can all that stuff be eliminated to clean up the engine compartment?

Seems that a vac line for the FPR, the brake booster, and the breather tube from the valve cover should be all we need..

[Hallen]

RealOEM has a part number search link on the uppper right. If I put in the part number you gave us, it comes back as the brake bosster check valve SUPPORT. Although it looks like a check valve so I don't know why they call it a support.

Check this link. http://www.realoem.com/bmw/showparts...34&fg=25&hl=55

[el bob]

RealOEM has a part number search link on the uppper right. If I put in the part number you gave us, it comes back as the brake bosster check valve SUPPORT. Although it looks like a check valve so I don't know why they call it a support.

Check this link. http://www.realoem.com/bmw/showparts...34&fg=25&hl=55

Ah cool, thanks. I was looking for a part number lookup feature on realoem but didn't see it before.

So yeah, that shows another 3 nipple check valve instead of the 2 nipple check valve in the picture. I'm hoping that realoem just has the wrong pictures for it, showing the early model check valve for both early model and late model queries.

Can anyone with an 89+ 325i/is see what their brake booster check valve looks like?

[DSP74]

can all that stuff be eliminated to clean up the engine compartment?

Seems that a vac line for the fpr, the brake booster, and the breather tube from the valve cover should be all we need..

repost

[el bob]

I checked out a 1991 325i Automatic car this past Sunday and it also had the 3 line check valve.

I really don't know why my 1989 325i has the two line check valve that I need another one of.

Ryan called the dealership and they wanted $72 for whatever product this part number is. 34331156703

[Lobstrosity]

You can use the 3 line one just fine. My 325i (euro engine) had it, and when I swapped in my m52, it only needed the 2 line one, but because the 3 line one just has two valves inside instead of 1, it works fine.

Also, it is just a standard check valve, so you should be able to get something much cheaper from a local auto parts store.

[el bob]

You can use the 3 line one just fine. My 325i (euro engine) had it, and when I swapped in my m52, it only needed the 2 line one, but because the 3 line one just has two valves inside instead of 1, it works fine.

Also, it is just a standard check valve, so you should be able to get something much cheaper from a local auto parts store.

Ah, that's an interesting point. I had not thought of that. I'll look into it asap.

[el bob]

^bump^

Anyone recognize the check valve in the picture?

[el bob]

The problem is that the photo shows only one type of check valve, the three line/nipple variety.

There's a part number for check valves up to 01/1989 --> 34331156299

There's a part number for check valves after 01/1989 --> 34331156703

It's possible the second part number is the 2 line/nipple type, but so far the local BMW dealer wants $70 for one. I'd like to get a better idea of whether or not it's the right part before paying that money if possible.

[el bob]

Still looking for this part in case any new people see this.

[el bob]

This weekend we ended up testing out exactly how the stock 3 nipple check valve works. It's actually pretty impressive.

Air can flow from the single nipple on the brake booster side to both the pre-throttle body (TB) and post-TB nipples on the engine side. That's the direction of the check valve.

Air can't flow from either the pre-TB or post-TB nipples into the brake booster. This is expected. Now here's the cool part. Air can't flow from the pre-TB nipple out the post-TB nipple, and vice versa. So the check valve as a whole is actually like two separate check valves packaged in one.

Therefore if you want to use a 3 nipple check valve like a two nipple check valve, all you have to do is use a piece of the factory rubber hose on one of the two engine side nipple, and plug it with a 0.5" OD round (1/2" stainless/alu/mild steel rod works nicely) object. This is what we did.

[PumpdUpKicks]

Stupid question, sorry to bring up old thread. Should the arrow on the check valve be facing towards the intake manifold or the brake booster?