Brake Booster Sensor after Brake Flush?

wyatth · 07-15-2019, 05:25 PM

Anybody have the PN for the sensor?

Or for the larger piece that includes the sensor? I need to balance cost of the part versus the labor. If the sensor is cheap but a PITA to replace, maybe I'll get the larger part if the install is simpler. Thanks!

kerrit · 07-15-2019, 05:33 PM

Quote:

Originally Posted by wyatth

Anybody have the PN for the sensor?

Or for the larger piece that includes the sensor? I need to balance cost of the part versus the labor. If the sensor is cheap but a PITA to replace, maybe I'll get the larger part if the install is simpler. Thanks!

you can't buy the sensor separately

https://www.ecstuning.com/b-genuine-...AaAiZvEALw_wcB

wyatth · 07-15-2019, 05:39 PM

Well, shit. $200 and a PITA install, love these surprises.

Dpc2u · 07-15-2019, 06:33 PM

Not a big savings, but I have used this seller several times, and always top notch and fast.

https://rover.ebay.com/rover/0/0/0?m...2F153503824242

Bartledoo · 07-15-2019, 09:58 PM

Quote:

Originally Posted by wyatth

Well, shit. $200 and a PITA install, love these surprises.

It's really not that bad with the tools I listed, I promise. If you can do the passenger rear spark plug without dying (which people really exaggerate) then you should be fine with this haha. I have big hands so I couldn't even get my hands involved at all. Was kinda like a game of "Operation"... I ordered mine from FCP...just in case it gets wet again in the future.

Bartledoo · 07-15-2019, 09:59 PM

Quote:

Originally Posted by kerrit

How excessive in your case? I have a new sensor ready, and have for two years - my pump will run for 30-60 seconds on start if it's been sitting overnight.

No codes, but expecting it to get worse, when it hasn't.

My pump would kick on almost every time I braked moderately.

wyatth · 07-15-2019, 10:09 PM

Mine is not every time I press the brake, but it's definitely multiple times throughout a drive and not just when I'm leaving the driveway as most claim/notice.

330ciprem · 07-16-2019, 06:24 AM

Ordered the sensor from FCP euro.

A loooooooooooong flat head screwdriver and swivel extension from Amazon.

Will tackle this on Monday as I am out starting tomorrow.

wyatth - If it helps these are the links:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Deansbimmer mentioned in one of the threads - one of those jobs in which its best to just jump into it.

wyatth · 07-16-2019, 10:39 AM

Thanks guys!

330ciprem · 07-22-2019, 10:42 PM

What a PITA job this was. Took me 3 hours!! THAT TOO WITH HELP!

Reaching all the bolts and sensors was such a pain - my back still hurts but job completed!

Erased the code and went for a 10 mile drive. Will go for another 40 mile drive to ensure it doesnt return.

Thanks to everyone for the help!

fs34 · 07-23-2019, 12:38 AM

Glad you knocked it out.

I’m about to do a flush, any recs/tricks to avoid this problem?

TX · 07-23-2019, 12:56 AM

Quote:

Originally Posted by fs34

Glad you knocked it out.

I’m about to do a flush, any recs/tricks to avoid this problem?

Edit:
If all you are doing is a flush just hook up a pressure bleeder to the reservoir and you won't have any leaks. Then hook up a catch bottle to whatever wheel you are bleeding.

Bartledoo · 07-23-2019, 01:46 AM

Quote:

Originally Posted by 330ciprem

What a PITA job this was. Took me 3 hours!! THAT TOO WITH HELP!

Reaching all the bolts and sensors was such a pain - my back still hurts but job completed!

Erased the code and went for a 10 mile drive. Will go for another 40 mile drive to ensure it doesnt return.

Thanks to everyone for the help!

3hrs!? Did you replace all of the hoses too??

roastbeef · 07-23-2019, 04:14 AM

my car went into limp mode and the dash turned into a christmas tree. it was still under warranty, so i didn't get all the codes and such. probably coincidental to your fluid flush.

330ciprem · 07-23-2019, 05:43 AM

Quote:

Originally Posted by fs34

Glad you knocked it out.

I’m about to do a flush, any recs/tricks to avoid this problem?

Remove that plate/plast cowl around the reservoir and place a towel under the tank over the sensor. Should be good then. No need to remove the complete the cowl - just the small plastic cover.

330ciprem · 07-23-2019, 05:44 AM

Quote:

Originally Posted by TX

Edit:
If all you are doing is a flush just hook up a pressure bleeder to the reservoir and you won't have any leaks. Then hook up a catch bottle to whatever wheel you are bleeding.

I got the motive bleeder sir, and that was a faulty unit...leaked at the reservoir tank cap.

Caused this headache.

330ciprem · 07-23-2019, 05:45 AM

Quote:

Originally Posted by Bartledoo

3hrs!? Did you replace all of the hoses too??

Shrek Hands here didn't help.

amrazM · 07-23-2019, 11:33 AM

Quote:

Originally Posted by Bartledoo

3hrs!? Did you replace all of the hoses too??

3hrs is right for the average person replacing just the sensor alone. It’s a pita to do whether you change the sensor or the whole pipe. It would take about 3hrs to do the way Bmw wants it done.

Bartledoo · 07-23-2019, 12:31 PM

Quote:

Originally Posted by amrazM

3hrs is right for the average person replacing just the sensor alone. It’s a pita to do whether you change the sensor or the whole pipe. It would take about 3hrs to do the way Bmw wants it done.

I guess it all comes down to whether you have the long needle-nosed pliers and telescoping magnet.

Dpc2u · 07-23-2019, 01:19 PM

Quote:

Originally Posted by Bartledoo

Quote:

Originally Posted by amrazM

3hrs is right for the average person replacing just the sensor alone. It’s a pita to do whether you change the sensor or the whole pipe. It would take about 3hrs to do the way Bmw wants it done.

I guess it all comes down to whether you have the long needle-nosed pliers and telescoping magnet.

Agreed, took me about 45 minutes. I have been pulling wrenches for years though.

Helmsman · 01-04-2020, 10:15 AM

Did a brake flush during the holyday. As I'm not clumsy I didn't bother to wrap the tank with paper towel... FFS, overfilled with a proper splash.

Cleaned up, rinsed with a tad water and left to dry for a couple of days. Took her for an hour spin today, no more pump buzz than I remember as usual, no codes. Crossing fingers till they get blue that I got away with my stupidity. Lesson learned, better be precautious then f@ck up.

I read shit can hit the fan later on, just have to drive and see I guess.

cgfr20 · 04-28-2020, 07:09 PM

Hi. I've been trying to trouble shoot a similar problem and came across this thread purely by accident when searching for photos of a servo check valve.
Anyway, I did a brake bleed on Sunday and of course I'm and idiot and I let some brake fluid overflow while filling. Since then i've been experiencing a stiff brake pedal after the car has been sitting for a few hours. I assumed it was a leak somewhere in the vacuum lines. Maybe a check valve or servo a gasket and thought maybe the brake fluid had corroded the rubber but I've since found out from a bit of googling that brake fluid doesn't damage rubber so I was ready to put it down to a coincidence that this issue started on the same day as the brake bleed until I found this thread.
It seems likely that I could have damaged the sensor but so far no codes and the servo seems to operate as normal when the engine is running. Is there any way a damaged sensor could lead to a loss of vacuum pressure over time when the engine is shut off or would there have to be a leak present for that to happen?

07-15-2019, 05:25 PM	#23
wyatth Colonel 3549 Rep 2,823 Posts Drives: E90 ZCP Join Date: Dec 2007 Location: Bay Area iTrader: (0)	Anybody have the PN for the sensor? Or for the larger piece that includes the sensor? I need to balance cost of the part versus the labor. If the sensor is cheap but a PITA to replace, maybe I'll get the larger part if the install is simpler. Thanks!
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07-15-2019, 05:39 PM	#25
wyatth Colonel 3549 Rep 2,823 Posts Drives: E90 ZCP Join Date: Dec 2007 Location: Bay Area iTrader: (0)	Well, shit. $200 and a PITA install, love these surprises.
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07-15-2019, 06:33 PM	#26
Dpc2u Major 11503 Rep 1,069 Posts Drives: E93 M3, E60 M5, F15 X5, E46 Join Date: Feb 2019 Location: Middle Tennessee iTrader: (0)	Not a big savings, but I have used this seller several times, and always top notch and fast. https://rover.ebay.com/rover/0/0/0?m...2F153503824242 __________________ E46, E60 M5, E93 M3, F15 X5 IG - @thebimmerhaus
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07-15-2019, 10:09 PM	#29
wyatth Colonel 3549 Rep 2,823 Posts Drives: E90 ZCP Join Date: Dec 2007 Location: Bay Area iTrader: (0)	Mine is not every time I press the brake, but it's definitely multiple times throughout a drive and not just when I'm leaving the driveway as most claim/notice.
	Appreciate 0 Quote

07-16-2019, 06:24 AM	#30
330ciprem Lieutenant 229 Rep 415 Posts Drives: 12 E92 M3, 06 E46 330ci, 6spds Join Date: Jan 2018 Location: Indianapolis iTrader: (0)	Ordered the sensor from FCP euro. A loooooooooooong flat head screwdriver and swivel extension from Amazon. Will tackle this on Monday as I am out starting tomorrow. wyatth - If it helps these are the links: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 Deansbimmer mentioned in one of the threads - one of those jobs in which its best to just jump into it.
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07-16-2019, 10:39 AM	#31
wyatth Colonel 3549 Rep 2,823 Posts Drives: E90 ZCP Join Date: Dec 2007 Location: Bay Area iTrader: (0)	Thanks guys!
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07-22-2019, 10:42 PM	#32
330ciprem Lieutenant 229 Rep 415 Posts Drives: 12 E92 M3, 06 E46 330ci, 6spds Join Date: Jan 2018 Location: Indianapolis iTrader: (0)	What a PITA job this was. Took me 3 hours!! THAT TOO WITH HELP! Reaching all the bolts and sensors was such a pain - my back still hurts but job completed! Erased the code and went for a 10 mile drive. Will go for another 40 mile drive to ensure it doesnt return. Thanks to everyone for the help!
	Appreciate 0 Quote

07-23-2019, 12:38 AM	#33
fs34 Lieutenant 395 Rep 416 Posts Drives: E46 M3 Join Date: May 2019 Location: Huntsville, AL iTrader: (1)	Glad you knocked it out. I’m about to do a flush, any recs/tricks to avoid this problem?
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07-23-2019, 04:14 AM	#36
roastbeef Lieutenant General 11583 Rep 12,723 Posts Drives: E92 M3 Join Date: Nov 2010 Location: Orange County, CA iTrader: (4)	my car went into limp mode and the dash turned into a christmas tree. it was still under warranty, so i didn't get all the codes and such. probably coincidental to your fluid flush. __________________ Instagram; @roastbeefmike
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01-04-2020, 10:15 AM	#43
Helmsman Major General 4444 Rep 7,101 Posts Drives: 2011 AW E90 M3 ZCP Join Date: Mar 2014 Location: Stockholm, Sweden iTrader: (0)	Did a brake flush during the holyday. As I'm not clumsy I didn't bother to wrap the tank with paper towel... FFS, overfilled with a proper splash. Cleaned up, rinsed with a tad water and left to dry for a couple of days. Took her for an hour spin today, no more pump buzz than I remember as usual, no codes. Crossing fingers till they get blue that I got away with my stupidity. Lesson learned, better be precautious then f@ck up. I read shit can hit the fan later on, just have to drive and see I guess.
	Appreciate 0 Quote

04-28-2020, 07:09 PM	#44
cgfr20 Registered 0 Rep 1 Posts Drives: e92 M3 Join Date: Apr 2020 Location: Dublin iTrader: (0)	Hi. I've been trying to trouble shoot a similar problem and came across this thread purely by accident when searching for photos of a servo check valve. Anyway, I did a brake bleed on Sunday and of course I'm and idiot and I let some brake fluid overflow while filling. Since then i've been experiencing a stiff brake pedal after the car has been sitting for a few hours. I assumed it was a leak somewhere in the vacuum lines. Maybe a check valve or servo a gasket and thought maybe the brake fluid had corroded the rubber but I've since found out from a bit of googling that brake fluid doesn't damage rubber so I was ready to put it down to a coincidence that this issue started on the same day as the brake bleed until I found this thread. It seems likely that I could have damaged the sensor but so far no codes and the servo seems to operate as normal when the engine is running. Is there any way a damaged sensor could lead to a loss of vacuum pressure over time when the engine is shut off or would there have to be a leak present for that to happen?
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