Master Cylinder RE&RE Question.

[PaulTWinterton]

What is the best way to re-install the filler pipe into a new MC?

Thanks for reading and replying.

[tim385]

Take that rubber piece off the end of your hose (its probably hardened a bit with age ) and now push the bare hose end into the grommet on your M/cyl.a small bit of rubber grease may help.

[M3M3M3]

yep!

[c.d.iesel]

use brake fluid as a lubricant on the tip of the pipe

before pushing into the rubber bushing

[PaulTWinterton]

Thanks for that. I'm a little surprised that BMW would design something where you jam a splayed flange through a narrow rubber opening.

It just seems to be asking for damage to the rubber.

Now I understand why people recommend doing this job with the MC disconnected from the peddle box.

Cheers.

[Mike Self]

It's much easier to install the supply pipe in the clutch M/C (especially the older metal pipes) before installing the M/C--then just thread it into position from the top of the engine compartment.

Before doing that, check clearance on the M/C mounting ears-they're often made so you can't get a socket on the nut holding the M/C to the pedal bucket. A little judicious grinding/filing on the M/C body (it's plenty thick) will give you clearance for a socket, making reinstallation much easier than using a box or open end wrench.

cheers

mike

[TobyB]

I'm a little surprised that BMW would design something where you jam a splayed flange through a narrow rubber opening.

yeah, it's a really odd quirk of these cars- there was probably a story,

involving ATE, several late- night meetings, and slivovitz...

t

[M3M3M3]

it actually a pretty standard way of attaching the feed line to any MC. the brake master works the same way. practically all ATE brake and clutch masters use the same flared fitting into a rubber bushing method, even the MC's with the reservoir mounted on top of them. now those are a MAJOR beeatch to get on and off.

it is really not that big a deal. i am also thankful it does take a bit of push to get them on. the lip makes it difficult for it to pop back out when you don't want it to....like when you have 15-20psi on the reservoir using a pressure bleeder.

[PaulTWinterton]

It went in easily enough, much to my surprise. Brake fluid helped, and yes it is a firm connection. Next time I won't be so worried.

Side note: I'm finding a lot of old black residue throughout the old system.

Pulled a rag through the filler pipe and it came out goopy. The reservoir has sludge in the bottom. Hmmm. I guess I'll push a whole lot of DOT4 through the entire system before I'm finished.