Tips for fitting MC grommets?

[Dennosaurus]

Just received a new set a brake master cylinder grommets for the lines that run from the mc to the reservoir. I managed to get one seated but the second is being a pain, I can get the grommet in the mc easily, and the connecting elbow in the grommet easily, but when the grommet is in the mc it just won't seat all the way down. Any tips on getting the elbow fully inserted?

 

 

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[Son of Marty]

Well the first thing I see is the feed hoses need to be replaced their pretty beat up as for the grommet use some syilglide(SP?) on it it's a lube for hydralic applications and available at Napa and give it a little twist while pressing down and it should seat.

[Buckeye]

I used lube to get connectors into the new grommets.

Get new connectors (34321102282) and probably not a bad idea to replace hoses (21521163714). It is brake system and is major safety so money well spent.

[Dennosaurus]

That was my concern I wasn't sure if it were safe to use a lubricant that wouldn't contaminant the brake system but I will try that out, thanks guys


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[Son of Marty]

Yes brake system compatible and your good to go.

[Drosselhebel]

Pop the grommets into the MC first. Dip the elbow in brake fluid (wear gloves!), and start it in at an angle so that the little flange at the bottom can grab the underside of the grommet, then just rotate it and it'll pop right in.

[Bibm5]

I just did these on Friday. I pushed the grommet in the Mc about half way then worked the fitting into the grommet then they seated in together perfectly.

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[Silver73tii]

HI Guys,

 

Thanks for the tips.  I have GE silicone grease that I use for plumbing and other rubber to metal lubrication needs, do you think that is ok to use?  

 

Whats the thinking on MC life expectancy on a well maintained car? I am doing this because the grommets are original and have shrunk and deformed and are leaking fluid.  This is the original MC.  Should I just replace the MC at this point?

 

Interested in opinions.

 

Thanks

[Simeon]

3 hours ago, Silver73tii said:

  I have GE silicone grease that I use for plumbing and other rubber to metal lubrication needs, do you think that is ok to use?  

 

I wouldn’t use anything other than brake fluid or purpose designed rubber brake grease for assembly lube. 

[Mucci]

What's the PN for those rubber grommets? I need to replace mine too. They're called out on realoem but there's no corresponding information. 

[2002]

Master Cylinder parts on this page:

http://www.bmwmobiletradition-online.com/bmw/showparts.do?model=2215&mospid=47140&btnr=34_0804&hg=34&fg=25

[dlacey]

if you need to lubricate anything in brake assembly use either castor oil or brake grease (made from castor oil)