Vacuum and power brakes?

[garold99]

Ok, I have a '71 with power brakes. Disk on front, drum in the rear. Little over a year ago my breaks started getting weak, I would have to pump them to build pressure 2-3 times. So I did the test to check the Power Booster, the one where the engine is off and you pump the breaks up then hold peddle down and turn engine on an if break pedal goes down some then the booster is good. I think thats right.

Anyhow since that was ok, I figured the Master Cylinder was bad. So got a new one, bench bled it (without a bench), and put it on. But still my pedal pressure was on the weak side and I would have to pump the breaks a couple times. Been this way since I put the new master cylinder on over a year ago.

So I was thinking, there is a vacuum hose running to the power booster, maybe there's a leak and thats the problem. But the big hose looks good running to the little T connector behind the carb. But there is a hose on the opp side of the T connector thats about 1/4 inch diameter hose roughly that looks fairly deteriorated. The hose is a few inches long and connects from the T connector behind the carb into a metal hose about 1/4 inch diameter roughly.

So my question, do power breaks use vacuum? And would this litte 1/4 inch (roughly) hose have anything to do with vacuum to the power booster?

Thanks