intake boot/brake booster hose

[FlexdXJ]

So I have a 90 325I vert(M20/auto trans), ordered a new intake boot thinking they would all be the same. They aren't... Anyways the new one does not have the port that connects to the booster line. I'm thinking I can just cap it off and I'm going to try that before I order a new boot but was just curious as to what the hell it does!

[vpilarrt]

The 2nd brake booster line is there to provide more instantaneous boost than the systems with the single line. I forget which years had which but it changed in the '89 or '90 timeframe.

[FlexdXJ]

Blocked it off, everything is business as usual. If any issues arise I'll just get the proper one but I really don't anything will happen.