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  #21  
Old 03-26-2018, 11:53 PM
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Why don’t you just remove the vacuum line from the booster and blow into it. You SHOULDNT be able to blow into it

From another member here that has been helping me diagnose these issues:
Quote:
Ok, blow towards the booster. So from the vacuum pump end and blow towards the booster. If you can easily suck air from the booster end then that definitely indicates a bad check valve.
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  #22  
Old 03-27-2018, 12:00 AM
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So any positive pressure going towards the booster is what I'm looking for to diagnose the check valve, got it. I'll take it off tomorrow and hope for the best.
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  #23  
Old 03-27-2018, 05:27 AM
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Exclamation

I finally got myself some E-Torx (female torx sockets) and got the Vacuum pump off. It uses 3 x E8 bolts to secure to the block. The o-ring itself seems to be fine although it is 13 years old... but there is some sort of weird black gasket-goo type sealant on this thing that appears to have disintegrated over time and worked its way into the engine (look at that black dot in the 1st pic below, and the green arrows in the 2nd pic) and collected on the pump itself. My replacement o-rings should be here tomorrow so I will complete the rebuild then.

Additionally my check valve ("non-return valve") is toast as well. I can blow into the hose with little resistance from both ends (i.e. the booster end AND the pump end). I need to find a new check valve and splice that in as well.

I'll post back after I do all that - I'm hoping there will be some improvement. Removing the booster looks like a REAL pain in the ass.
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  #24  
Old 03-27-2018, 05:54 AM
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One more photo. It's fairly obvious it's been leaking for a while. I also got an "Oil Pressure Low" warning on the dash the other day but obviously the oil level is fine as is the oil pressure. I suspect the cause of this is oil leaking onto the electrical connector that plugs into the oil pressure sensor -- this sensor is directly below the vac pump.
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  #25  
Old 03-27-2018, 02:23 PM
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Had my booster tested earlier and it pulled 0 vacuum, so there's my situation.
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  #26  
Old 04-01-2018, 06:57 PM
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After rebuilding my brake booster with Viton o-rings I still have no improvement to the symptoms in the first post of this thread.

I am just waiting for my check valve to arrive. If that doesn't make any improvement, I suppose the only thing left to do is replace the booster.
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  #27  
Old 04-01-2018, 07:06 PM
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I actually replaced my booster last night and it fixed my problem.
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  #28  
Old 04-02-2018, 01:07 PM
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Congrats!
__________________

2005 X5 4.8IS
The Blue ones are always FASTER....

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  #29  
Old 04-10-2018, 01:25 AM
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Ever get yours sorted out?
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  #30  
Old 04-16-2018, 07:02 AM
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My brake vacuum line has now arrived, just waiting on the booster.

Has anyone just replaced the line before? The line sits on a grommet which runs through the plastic shield in front of the firewall. It looks like a real bitch to remove. It looks like a ton of stuff has to come out for this to be removed?

I've seen several people replace the booster itself but I don't want to take any unnecessary risks, might as well replace the line (it is relatively inexpensive)!
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