FS 2800cs real BMW/Ate master cylinder repair kit 3431110373

[Stevehose]

I bought the wrong size, this is for the earlier 23.81mm master cylinder, I need the smaller one. These are currently over $150 plus shipping on back order with no eta on the BMW parts sites. I can do $100 shipped to USA, international would be at cost. Sealed in original packaging. Rebuild your master or have as a backup if you’re ocd like me!

 

[Enfeh]

Hi there, I am just starting to restore my 1971 3.0cs. I would like to have it but how could I tell what size my master cylinder is?

 

[Ohmess]

I had trouble with two aftermarket rebuild kits I purchased when I did mine. Seals has turned to mush; they had obviously been on a shelf somewhere for a very long time. Recommend skipping that step and going straight to BMW parts.

 

[Thomas76]

I'm interested if anyone ahead of me doesn't work out. In Michigan ready to buy.

 

[Stevehose]

If you have the thin pancake brake booster this will fit, if you have the bigger brake booster, you need the smaller one like me, right @HB Chris ?

Hi there, I am just starting to restore my 1971 3.0cs. I would like to have it but how could I tell what size my master cylinder is?

 

[Stevehose]

If @Enfeh doesn't want it, it's yours. Thanks.

I'm interested if anyone ahead of me doesn't work out. In Michigan ready to buy.

 

[Thomas76]

Cool thanks. I'm on the road today, but will be back online this evening to manage anything that comes together

 

[Cornishman]

FYI, I used a special seal installer to put the piston with seals back into the body of the master cylinder. This made it easy and reduced the chance of damaging a seal. This was RHD, so may be slightly more complex than LHD.

The seal installer was a machined sleeve that tapered and fitted nicely into the body of the master cylinder. I borrowed it the BMW U.K. car club.

 

[Enfeh]

Ok, help, this is what I have, see attached pictures. Is this considered the thin pancake booster

If you have the thin pancake brake booster this will fit, if you have the bigger brake booster, you need the smaller one like me, right @HB Chris ?

FYI, I used a special seal installer to put the piston with seals back into the body of the master cylinder. This made it easy and reduced the chance of damaging a seal. This was RHD, so may be slightly more complex than LHD.

The seal installer was a machined sleeve that tapered and fitted nicely into the body of the master cylinder. I borrowed it the BMW U.K. car club.

Thanks for the tip.

 

[HB Chris]

If you have the thin pancake brake booster this will fit, if you have the bigger brake booster, you need the smaller one like me, right @HB Chris ?

• Brake booster changes from pancake style to thicker style at 2240222 and 2250146, Master Cylinder diameter changes from 23.8mm to 22.2mm

 

[Enfeh]

I guess mine will be the thicker booster. Thanks for the help.
Steve thanks for the opportunity.

 

[americium]

My 2800, 2460087, has the 23.8mm bore size. The booster looks like yours.

I just got a kit and rebuilt it.

 

[HB Chris]

Boosters changed for the e3 as well sometime in 1972.

 

[Stevehose]

So his is the pancake therefore he needs this cylinder size kit, yes?

• Brake booster changes from pancake style to thicker style at 2240222 and 2250146, Master Cylinder diameter changes from 23.8mm to 22.2mm

 

[HB Chris]

So his is the pancake therefore he needs this cylinder size kit, yes?

Yes

 

[Stevehose]

Thanks

Yes

 

[Enfeh]

Awesome. Thank you.

 

[autokunst]

My '73 3.0CS had the larger bore (23.8). I just rebuilt it as well. I made a homemade, one-time use "funnel" to install the piston assembly and not damage the seals. This is a nice find!

 

[Thomas76]

I'm confused, is enfeh buying the kit?

 

[Enfeh]

Yes. I did.