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-   -   Brake booster Vacuum Check valve and grommet replacement on 335i (

hondo402000 02-02-2013 08:34 AM

Brake booster Vacuum Check valve and grommet replacement on 335i
There was a thread about a hard brake peddle upon car sitting over night, So the tread said the check valves were known to leak and or the grommet was leaking, well I purchased the check valve, about 30 bucks and the grommet(BMW calls it a gasket) for like 3 bucks. I just finished replacing them on my 2007 335i, it was a pain, ended up taking the cabin filter out and the cover under the cabin filter, and I un bolted the ABS module, I didnt disconnet any break lines but it did give me more room to pry the old check valve out, the Grommet was easy to get out, a little more difficult to install, but I did manage to get it back together. Now I will see if by sitting overnight the vacuum holds in the booster and the peddle is easier to push down, I did check the old unit by sucking on the valve and it was leaking so that was the problem, . so hopefully that will take care of the hard peddle issue

minor tools needed to do the repair but a set of locking hemostats came in handy griping the grommet while lining it up and working it back in with a screwdriver.


fun2drive 02-02-2013 10:56 AM

Mine leaks but it isn't much of any issue since it only happens if my car sits a long time. I will get around to doing this. Interesting that it leaked when I let the car sit but take to the dealer under warranty is would not leak since they didn't let it sit for maybe 5 days.
Good to know it is no big deal to replace...

hondo402000 02-02-2013 01:08 PM

well, not a big deal, just a little difficult to get to, could be a lot of curse words involved, and getting the nuts off of the ABS system without dropping them under the brake booster is a challenge. if you have patience you can do it, Definitely not a big deal if the BMW palace does it. Now thinking like a woman, No offense, but I just save 300 bucks now I can go get that new Sig 9mm gun I want

Yea, I need to do more repairs so I can save money and spend it on something else


hondo402000 02-03-2013 06:48 AM

checked the brake peddle this morning, Great, still had an easy peddle, so the fix worked


hondo402000 02-09-2013 08:29 AM

well my car sat for a week and still had a vacuum for a soft peddle feel at start, issue solved


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