Slight problem with sizes... Brake reservoir to master

[JackBennett]

Um, slight problem with the size of the mounting holes on my new reservoir. Can anyone tell me what is up with this? Pic is current res, new master, old master... Incorrect res? Incorrect new master? Something else? Point me to the part I need?

And here I thought the hard lines and bleeding would be the hard part... ugh.

[HBChris]

Don't know what master you are using but the rubber grommets should swap over to the new MC once you remove the plastic plugs. If not, there are grommets you can buy from BMW to accommodate the different ID and OD. This is the case when converting early single line brakes to the e21 style MC which uses a reservoir similar to yours.

[JackBennett]

Thx Chris... In looking I think I have a e21 reservoir on there. Trouble is the pipes from it are almost the exact diameter of the holes on the new master when the grommets are removed so I think there is no way to make it fit.

I guess I'll just have to find the correct reservoir for it and bring it back to stock. Or???

The PO did some good stuff but made a bit of a frankencar outta her and I'm still finding little things 5 years on, things like this.

[ray_]

Did the '76's have the reservoir directly mounted to the master?

I know the early cars did not..,

Look at the engine pic here, you likely should have the remote reservoir.

http://cgi.ebay.com/ebaymotors/1976-BMW-2002-Coupe-2-Door-2-0L-Automatic-Air-Conditioning-/170951077292?pt=US_Cars_Trucks&hash=item27cd7a6dac

A pic of the remote: http://smg.photobucket.com/albums/v355/raykoke/?action=view&current=IMG_0008.jpg

Whether the m/c is correct, I dunno :-)

Cheers,

[JackBennett]

Still trying to find that out... Haynes says the N. American in '76 had the res directly on the master but ... It maters little to me to be bone stock.. so long as I can stop I'm happy.

[ray_]

Yeah.

I'm betting your master was switched. Stock 02 m/c's have dual lines to the front brakes... do you??

Cheers,

Still trying to find that out... Haynes says the N. American in '76 had the res directly on the master but ... It maters little to me to be bone stock.. so long as I can stop I'm happy.

[JackBennett]

yes... it does have 5 lines coming off of it... 4 brakes and one for clutch... I did not trace them but I have to assume that is where they go.

Also, I'm not seeing anywhere for the remote(?) reservoir to mount under there so I have to assume it was one with an attached res originally.

[M3M3]

no. there is no line for the clutch on the brake master cyl. five lines for the brakes. two for each side in the front and one for the rear.

[JackBennett]

Indeed, decided to trace them back and of course, you are correct.

Also popped the rubber grommet out of the new master and the pipe from the reservoir is indeed just too big for it. I could probably get a rubber o-ring around it and just barely get it in there but I don't know if that'd suffice. Bummer.

[HBChris]

Measure the ID of the master and the OD of the reservoir and then call on Monday to Mesa Performance in Costa Mesa CA and ask Jim or Spence what size grommet you need. With the early (69) reservoir it used a 17/8mm grommet, e21 uses 22/12, I used a 22/8 to convert from early MC to e21 MC, part number 34311121911. Maybe this will work for you, if not they will have the answer. I never knew the 76 used a reservoir that sits on the MC like the very early cars. HTH.

Chris

[TobyB]

Is that the early reservior? I know I pulled one of those mc/reservoir

arrangements out of a parts car, but I don't remember the vintage....

But yeah, get a 'usual' reservoir and the hoses and elbows and you'll

be good to go.

t

[nbcbird]

Jack--Nobody mentioned the difference between the regular MC and the tii version. There are different grommets for each of the them IIRC. The grommets I used (for a tii) fit into the recess and didn't have a shoulder on them. Just looked at my old MC, which resembles you new unit. Agree with Toby's advice that your reservoir is a misfit.

[JackBennett]

Yeah, I've looked it over and over and I'm going to need to go with a stock MC, no way around it.

So... New question... Anyone in the Seattle area have one with the hoses and elbows that they'd like to sell me? I'd be down for out of town too but I'd like to get it up and going sooner than all that if possible.

Thanks for all the help as always guys and gals.

[02Les]

According to the parts book, the very early USA 1600-2 & 2002 had a master cylinder with piggy back reservoir.

orig part# 34 31 1 103 456 was for the complete assy - now NLA.

However, 34 31 1 113 656 is available (item 1 in below pic) but I doubt it comes with the reservoir even if the pic shows it.