Brake Booster Opinions

[rusty71]

I converted my 71 to have power brakes, I'm certain I have all the pedal rods adjusted correctly, because the pedal travel and play in the pedal feel pretty good. My problem is my brake pedal is still hard. I had a new 7" single diaphragm booster on the shelf so I just used it. Do you all think it could be too small for the truck? My engine is a stock 350 and makes plenty of vacuum. With the engine off and pumping up the brake pedal, I can't hear or feel the vacuum leaking the booster. When I start the engine with the pedal pushed I didn't notice the pedal drop either. This makes me think the booster is bad rather than the rod not pushing the master cylinder piston all the way in, I didn't seem to have any trouble bleeding the brakes when I did that. Any opinions would be appreciated.