[GH85Carrera]

The only brakes I have ever bled were my 74 914, the 85 911 and my El Camino.

I sold the 914 26 years ago so it is not fresh in memory, but it was easy, 100% manual system. My 911 gets a brake fluid change every single spring, no exceptions. The mater cylinder has never been replaced or had any issues.

I have a vacuum bleeder, a hand operated small one that needs frequent dumping of the little catch can. I bought a much bigger vacuum pump and it holds over a gallon, so no issues of it filling up.

I always see bubbles, and I always assumed it was from the bleed screw to the vacuum hose connection. I always get a nice firm pedal, so the bubbles don't ever bother me. My El Camino power brake and master cylinder developed an air leak about a year ago, so the original was only good for 35 years, and 370,00 miles. I change the brake fluid on the Elky every third year.

Bleeding the brake drums in the rear is a rear pain in the butt, as the bleed screw is almost hidden up inside the drum housing. That is a big reason I am less proactive about the bleeding. No way to get the vacuum hose or any hose on it, so it just makes a mess on the floor, that I have to clean up. I use a metal catch pan and a oil drain pan that gets most of it, the metal drip pan gets the rest. It is still a mess.

I would suggest you just ignore the bubbles, and go by pedal feel as to getting the air out of the system.