I give up with brake bleeding

[vstol]

I will use the lower hole in the 71 corvette pedal for the power brake setup thanks

[Hydratech®]

You're trying to inject a different issue -- which is to try to use the wrong position. The lower hole (closer to the floor) is there for POWER brakes - and the booster is at an angle so the rod and arc etc work correctly. The Manual brake position is about 1 inch higher -- making it a straighter "angle" -- and the factory manual master is mounted as such -- flat to the firewall.

Rest assured that I am certainly not trying to cause any trouble. In fact, I'm only making it certain that "under discussed" issues are crystal clear for some of our members / readers.

[vstol]

No issues here thanks for all your help guys. Once it is set up I will get back and close this out.

[dontlifttoshift]

So you are going to power brakes?

[vstol]

YES, booster came today

[Hydratech®]

Have you attempted to install your vacuum booster yet? If not, be warned that the C3 Vette steering column support bracket is different than the power brake support. I have no earthly idea why Chevrolet did that. Besides having to cut a different hole lower down in the fiberglass firewall for the vacuum brake booster location, you will also find that the bolt pattern isn't anywhere near what you need for the bottom two mounting points. The top two MC mounting studs can be extracted, which then at least places the top two vacuum booster mounting points in the correct location, but then you find that the lower two mounting points will not correlate properly with the manual brake spec steering column support structure (which is what the C3 Vette vacuum boosters essentially bolt to) (besides the fiberglass). I checked out a bit of your build thread and see that you are a competent fabricator. I recommend you pull the manual brake steering support structure out and weld in some further material at the bottom of the bolt pattern to properly support the bottom two fastener points of your vacuum booster, OR swap in a factory C3 power brake spec steering column support bracket.

This why we developed a special direct bolt in C3 manual brake spec conversion system that accommodates the different manual brake firewall and the different manual brake spec steering column support bracket:

http://www.hydratechbraking.com/C3Co...920161312A1BD0

Rest assured that I am not sales pitching you on a hydraulic brake assist system, just covering the bases on converting a factory manual brake C3 Vette to a power brake (bizarre why Chevrolet did that)...

[Hydratech®]

As another interesting and pertinent side note, (that some do not know or consider in their builds), be aware that the Wilwood MC's are specifically designed to provide a 75/25 output (75% to the front, but only 25% to the rear). By direct comparison, the factory C3 MC's are designed to provide approximately a 65/35 (65% to the front and a larger output of 35%+ to the rear). You have been mentioning that your front brakes are behaving, but can't quite get your rear brakes to bite down properly. Soooo.... The output difference between the Wilwood MC and the C3 Vette MC's are indeed different - the C3 MC's put out more volume to the rear brakes by design (it's the location of the comp ports inside the fluid wells of the MC fluid bowls that makes the difference).