1972-1981 (E12) knowledge base

[JKuhn]

Hey y’all! I know there’s not much on the E12 thread, but I’m picking up a 81 E12 5spd in a couple weeks. The brake booster needs replacing, is there a guide in which to do this properly. It’ll be my new daily since my subaru is just a liability.

Nice. And also welcome.

If it's anything like the RHD E12/8 that I had, replacing the booster should be easy. In my car it was not mounted to the firewall, but on a bracket further to the front. Believe me, replacing a booster that's mounted on the firewall can be a pain unless you have extremely small hands, and extremely long fingers.

Basically if you can reach all the bolts/nuts it'll be easy. No bleeding required since you're not touching any hydraulics, and you simply have to remove it, bolt the new one in, and bolt the master cylinder and pedal linkage to the booster.

Oh, and be sure to post some pictures once you have it. This thread can do with more pictures.

[Bibiguy97]

Hello, so i have a question....which intake manifold is better the old e12 528i intake manifold old style runners? Or the later e28 528i intake manifold? Im currently running the old style but i have the e28 one on the ready with the wiring harness and everything. So which one is better?

[e12Euro]

Hello, so i have a question....which intake manifold is better the old e12 528i intake manifold old style runners? Or the later e28 528i intake manifold? Im currently running the old style but i have the e28 one on the ready with the wiring harness and everything. So which one is better?

The old style e12 manifold is better for performance. The e28 intake was developed to maximize torque and fuel economy. Some e28 owners have put the e12 intake on their cars! The e28/e34 M5 intake is also like the old e12 log style.

[Bibiguy97]

Okay then imma stick with the e12 manifold
Thank you for the insight🤗