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.

Hondo

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...

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


Hondo

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

Hondo

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

Hondo