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Old 07-18-2019, 07:24 AM
BabyUnicornTaco BabyUnicornTaco is offline
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Are brake boosters/vacuum pumps rebuildable?

08 4.8i. My brake booster/vacuum pump is failing in its internal parts. Not leaking. Are there any rebuild kits for this or is ordering part # 11667635657 the only way? It was just resealed but I can hear the internals screeching.


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Old 07-18-2019, 07:51 AM
twh twh is offline
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The rebuild kits are just a couple of gaskets. If you are hearing noises, I'd just buy a new a new one.
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Old 07-18-2019, 10:37 AM
BabyUnicornTaco BabyUnicornTaco is offline
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Since this unit was just resealed and these are the internal parts making the noise, is this an impending, doomful failure coming up or do I have a little time? Quickest I could install it is a few days from now and I have some traveling to do. Love the timing on these things.
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Old 07-18-2019, 11:23 AM
BabyUnicornTaco BabyUnicornTaco is offline
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I ordered one from ECS. Arrives tomorrow by noon. I'll just replace and move on. Thanks.
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Old 07-18-2019, 09:00 PM
ard ard is offline
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Just gotta say.....B.U.T. you have the absolute WORST luck. If one can have a problem w a V8 X5, you find it....
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Old 07-18-2019, 10:39 PM
deroy deroy is offline
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Pls post pics of the inside of the old one.


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Old 07-19-2019, 05:13 AM
BabyUnicornTaco BabyUnicornTaco is offline
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Originally Posted by ard View Post
Just gotta say.....B.U.T. you have the absolute WORST luck. If one can have a problem w a V8 X5, you find it....


Ha. Maybe. Maybe not. Your comment made me think this over and look back at any issues Iíve had. Other than 8 punctured tires replaced in less than 4 years, my transmission solenoid that went bad, and the timing on this vacuum pump failing, I think I have just done all the possible things that go bad all at once. Oh yeah, wrong plugs that one time (canít forget that). Weíll see what tomorrow brings.
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Old 07-19-2019, 05:36 AM
BabyUnicornTaco BabyUnicornTaco is offline
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Pls post pics of the inside of the old one.


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Will do.


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Old 07-19-2019, 02:57 PM
BabyUnicornTaco BabyUnicornTaco is offline
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New vacuum pump installed. Same sound. I'm stumped. I'm fine with a proactive pump replacement but I'd really like to figure out this sound that I swore came form the vacuum pump. Sound is intermittent but can get louder than this video. When I was at the shop for my alignment, the mechanic stuck his head in and couldn't hear a thing. I couldn't either. The guys at my shop said my X5 was super smooth running. The video is 17 seconds long. After 5 seconds or so you will hear a faint screeching sound, then again a little louder. Suggestions are appreciated. X5 runs fantastic other than this random noise.
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Old 07-19-2019, 03:04 PM
twh twh is offline
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Get a mechanics stethoscope. It may help you narrow it down.
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Old 07-19-2019, 03:28 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Troubleshooting some more. The screeching is there when the AC is on or off. The pitch changes as soon as the vent fan speeds are turned on or completely off but does not disappear when this is done (change in engine load). It definitely seems to be from the area of the vacuum pump but I think that leaves pulleys and the AC condenser as the only possibilities left. I guess the stethoscope is next in line. I did tighten the AC tensioner a month ago to spec but I don't know if this is related at all.
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Old 07-19-2019, 11:27 PM
robnitro robnitro is offline
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If it changes with fan speed it could be the alternator, because the fan adds electrical load.
Try the rear defroster, it takes much more load.
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Old 07-20-2019, 12:19 AM
OakTone OakTone is offline
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Quote:
Originally Posted by BabyUnicornTaco View Post
New vacuum pump installed. Same sound. I'm stumped. I'm fine with a proactive pump replacement but I'd really like to figure out this sound that I swore came form the vacuum pump.

I have a different vehicle but the same V8 and vacuum pump (E60 with N62TU). Also experienced some weird high-pitched noises (after replacing the inner and outer seals on the pump and reassembling), though not identical to those in your video.

This is a long shot, but try loosening/retightening the vacuum hose on top and the little cap on the front of the vacuum pump. In my case it turned out the small one had come loose. (On my 550i itís actually a thin vacuum line leading to the exhaust flap, though many owners end up just capping it off like yours.)

The squealing was surprisingly loud, although it didnít affect brake boost. I found by experimenting that if either hose or cap is the slightest bit loose, it can make a variety of whistling or hissing noises as air finds its way through one way or another. Only after replacing one section of tubing and getting a tight seal with a new hose clamp was I able to regain peace and quiet (at least by running V8 standards).

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  #14  
Old 07-20-2019, 04:33 AM
BabyUnicornTaco BabyUnicornTaco is offline
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Quote:
Originally Posted by OakTone View Post
I have a different vehicle but the same V8 and vacuum pump (E60 with N62TU). Also experienced some weird high-pitched noises (after replacing the inner and outer seals on the pump and reassembling), though not identical to those in your video.

This is a long shot, but try loosening/retightening the vacuum hose on top and the little cap on the front of the vacuum pump. In my case it turned out the small one had come loose. (On my 550i itís actually a thin vacuum line leading to the exhaust flap, though many owners end up just capping it off like yours.)

The squealing was surprisingly loud, although it didnít affect brake boost. I found by experimenting that if either hose or cap is the slightest bit loose, it can make a variety of whistling or hissing noises as air finds its way through one way or another. Only after replacing one section of tubing and getting a tight seal with a new hose clamp was I able to regain peace and quiet (at least by running V8 standards).

ó
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Iíll check it out. Thanks. Anything is worth a shot, although this noise is with two different vacuum pumps after I verified a good snug fit with the cap and the vacuum hose on both.


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Old 07-20-2019, 04:40 AM
BabyUnicornTaco BabyUnicornTaco is offline
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Originally Posted by robnitro View Post
If it changes with fan speed it could be the alternator, because the fan adds electrical load.
Try the rear defroster, it takes much more load.


Good thought. Iíll try increasing the load and see what happens. It is definitely quieter on the alternator side than the vacuum pump side. Do you say alternator because it may not be working well or because of its pulley?

I will also loosen the AC tensioner just a bit and see if when it was tightened to spec it put just a little too much tension on one of the pulleys (I think 4) on that side.


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Old 07-20-2019, 05:18 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Turning on the rear defroster does not change anything. Sounds like this must be a pulley. Sound stops for a second when AC and vents are turned off but returns at a different pitch. Iím guessing itís the AC belt tensioner. Iíll listen with the stethoscope when it arrives tomorrow. Or is it better to remove the belt and then just spin each pulley? Looks like a tough pulley to hear due to hose placements.


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Old 07-20-2019, 11:42 PM
deroy deroy is offline
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Originally Posted by BabyUnicornTaco View Post
Turning on the rear defroster does not change anything. Sounds like this must be a pulley. Sound stops for a second when AC and vents are turned off but returns at a different pitch. Iím guessing itís the AC belt tensioner. Iíll listen with the stethoscope when it arrives tomorrow. Or is it better to remove the belt and then just spin each pulley? Looks like a tough pulley to hear due to hose placements.


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Or the compressor itself. I suppose you have the solenoid clutchless version too. Remove ac belt and start it up to test.


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Old 07-21-2019, 04:04 AM
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Doug Huffman Doug Huffman is offline
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Or the compressor itself.
ĒHey, are you sure those arenít zebra hoofbeats? Maybe you ought to check for zebras too.Ē /sarc
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Old 07-21-2019, 05:10 AM
BabyUnicornTaco BabyUnicornTaco is offline
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Or the compressor itself. I suppose you have the solenoid clutchless version too. Remove ac belt and start it up to test.


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Iíll check it. Could be the bearing on the compressor causing the screech.


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Old 07-21-2019, 12:13 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Are brake boosters/vacuum pumps rebuildable?

I took the ac belt off. Ran the engine. No more noise. That seemed to narrow it down to the tensioner pulley or the condenser. Spinning the condenser pulley is smooth, pretty quiet, and there is no wobble. Found the tensioner to spin quietly but it does have a little bit of front to back wiggle.


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Old 07-21-2019, 12:37 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Anyone know the size of the bolt that is under the pulley cap? The one that runs through the pulley itself on the ac tensioner.
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Old 07-21-2019, 12:49 PM
deroy deroy is offline
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ĒHey, are you sure those arenít zebra hoofbeats? Maybe you ought to check for zebras too.Ē /sarc


Compressor pulley and tensioner pulley both have a bearing. You seem to suggest one is more likely to fail than the other. Why?


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Old 07-21-2019, 12:51 PM
deroy deroy is offline
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Anyone know the size of the bolt that is under the pulley cap? The one that runs through the pulley itself on the ac tensioner.


From all wrenching you did it is safe to assume you have the bit in your collection.


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Old 07-21-2019, 02:06 PM
BabyUnicornTaco BabyUnicornTaco is offline
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From all wrenching you did it is safe to assume you have the bit in your collection.


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Bit yes. I just donít know the size of the bolt in case I start with just replacing that. Iíd like to replace just the pulley but it is hard to find.


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Old 07-21-2019, 05:37 PM
BabyUnicornTaco BabyUnicornTaco is offline
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Iíve managed to confuse myself a bit. Newtis shows that both bolts on the tensioner get tightened to the same spec. Now I have never been able to tighten the top bolt to spec. When I took the belt off, the bolt can now be tightened much further. Check out the picture. The shiny 1/3 of bolt at the bottom is how much it could tighten with the belt off. Should this belt have been tightened this much with the belt on and and I never got there or am I missing something. This tensioner has been my only fight after my big work. Obviously. Ignore the old oil. Click image for larger version

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