Master cylinder question

[Desert Driver]

My '84 has paid a visit or two to Hackville. I have reason to believe the original master cylinder was replaced with the one pictured. The outfit that rebuilt my booster pump thinks it's off a Corvette and may not be simpatico with the booster. Anyone know what Mr Blake put on his Avantis at the South Bend plant?

[grant mills]

photo of my original brake master cylinder from an 84 Avanti. The label on the booster is to indicate DOT 5 only.

[Desert Driver]

Any idea what brand or numbers stamped on your master cylinder?

I see your flex hose to the air cleaner is off and chewed up. They're a bear to reinstall 'cause the round hose does not like being made into an oval.

[grant mills]

My flex hose is off, as yesterday I replaced the fuel filter in the carb housing. (hoping to correct a very recent failure where the engine dies as I come to a stop). I well know about the problems with the flex hose and have considered getting replacements but fear the "fun" of installing them. As to the brake....there are no brands stamped on the housing. There are 2 sets of numbers, one for the master cyl. and the other for the fluid reservoir. The number on the master cyl is: 7K3 082A 10 02  (with the spacing as shown). The reservoir is: 306 FA 1379A.    I may be wrong about the FA..it may be PA, but I could not get all the crude off the side of the housing

[Desert Driver]

Many thanks for all the info. Good luck on the flex hose...it's just one of things that makes you wonder what they were thinking! 🤬

[grant mills]

It only took me about 5 minutes to put both flex hoses back on. But as I did it, I got to wondering why someone doesn't just make a short conversion piece that fits over the  oval and then expands to a circle to accept the flex hose. I think a simple 3D printer could easily make one, given the dimensions of each end