Power Brake Booster Check Valve Replacement?

rarrieta82 · Post by **rarrieta82** » 26 Jan 2014, 23:12

Hello, I have a 2000 Volvo S80 2.9. I had a hissing sound coming from the engine compartment. When I went to inspect it I saw a hose coming from the intake manifold that leads to a plastic piece that looked like it was deteriorating. I noticed there was a vacuum leak coming from it and it actually broke off when I was messing with it. My brakes now only work when I press them really hard and the engine idles really rough. Upon a little research, I concluded that the plastic piece that broke must be the power brake booster check valve. I just want to confirm that it actually is that part I need to get and I also want to ask where can I find it? I am located in Los Angeles and I can't find it at the typical auto parts store. Also, is it an easy fix? I am a simple DIY guy and can handle typical tune up stuff but am not built to handle bigger jobs. Lastly, how long can I drive like this without doing major damage to my car? I can handle braking using all of my might but I hear I can warp the rotors if I continue to drive in this manner. Please help this noob! Thanks for all of your feedback.

Post by **jimmy57** » 27 Jan 2014, 06:59

Can you post a cell phone shot of the part? Thr brske booster check valve is where the hose the attaches to the brake booster. I am unsure if a 2000 2.9 has a venturi vacuum "pump" and that may be what is cracked. If the thing that cracked is that item you can for a time do without it and use a longer piece of 3/8" ID fuel/vacuum hose from a parts store to go from fitting on intake manifold all the way to booster check valve.

You will like set a check engine light from the leak.

The brake rotors are in no risk of harm. Your high pedal effort is not translating into higher force on brakes. Exactly the opposite. WIth no power assist you are just developing a stronger leg and the brakes are getting less force. Your risk is running into someone in an unexpected panic stop.

rarrieta82 · Post by **rarrieta82** » 27 Jan 2014, 09:25

Thank you very much, your feedback is much appreciated. Here is a picture of the broken part. To the left of it is the hose that it was connected to, which was coming from the intake manifold.

Bluevanacd2005 · Post by **Bluevanacd2005** » 27 Jan 2014, 09:42

That is a check valve. It looks like it melted.

rarrieta82 · Post by **rarrieta82** » 27 Jan 2014, 13:55

Any idea where I can find this part in Los Angeles?

Bluevanacd2005 · Post by **Bluevanacd2005** » 27 Jan 2014, 17:55

No idea. I live in Michigan but I know none of the typical ones (Napa, Auto zone, O'Rileys) would have them though. I did use a plastic spring check PCV valve in place of a vacuum check valve before when I ran into an issue sort of like yours.

THAI UNG · Post by **THAI UNG** » 28 Jan 2014, 16:47

I bought one from PartsGeek ATE brand but took about one week to get to me .In your case is better go to the dealer and prepare for the high price.After you bought it ,go to auto part and buy heater hose that fit the vacuum check valve stem about one foot long (I do not think they will sell less than a footlong).
Pull out the old hose that sit between intake manifold and old check valve it is no good anyway if there any pressure clam ,use plier squeeze to open and pull the hose with other plier.Push a new hose into the intake and clam it , if it is too long cut some off,push in a new valve.A hose from the booster need to be cut about an inch off away from old valve stem too and push it to the other end of the valve, make sure the valve body did not touch or rub with other part.I did mine a year ago ,this the best I could remember .Hope it help...