Hydroboost / master cylinder issue?

[Taylor1969]

I had read a little bit over there. Enough to know the first gen guys were doing a 15 degree bracket, and using the power brake hole in the stock brake pedal. Dunno what pedal ratio that is exactly, but it's what is aligned the best when I installed the hydro on the 15 degree incline.



I maybe could have done the spacer like was mentioned, but I was a little aprehensive to do that since any kind of unforeseen "failure" there would be catistrophic to the car, me, and probably someone else as well. Also may have been a bit tricky to get it to stay in there while I installed the MC, since the rod would try to slide out.

Based the "shallow" vs. "deep" pic that I posted I decided the easiest and quickest thing to do would be to swap MCs. I think it's 76 or 77 is the year the GM changed.

For $17.77 at Advance Auto I bought a rebuilt 78 Corvette master cylinder that is the late model "shallow" style MC. I got likely that the ports on the MC were exactly the same size as the one I removed, so the swap was nice and easy. Only issue I ran into (and one I had read about, thankfully) was that the master wouldn't go all the way up to the flange on the booster. Sort of rocked back and forth - of course the problem was that the rod on the booster didn't match the shape of the indention in the MC very well. My carbides made short work of that. Couple of tries and she fit just fine.

So I hooked everything up, bled the brakes and took her out for a spin. What a difference. I'll have to set my idle up a bit. If I nail the brake it wants to kill the motor from the extra HP sucked up by the pump I guess.

The power steering is very nice too. That IROC box feels great! Now I realize how poor my handling is. But that's okay, I have plans for that, too.

Anyhow, thanks for the ideas, the replies, and the info. Just thought I would report back on what worked.

Gotta love the info sharing out here in cyberspace

What did you do for lines? I have an IROC pump and hydroboost already installed, but no lines to the hydroboost yet.