Vacuum Brakes Hard Pedal

[85Supreme]

Hey guys, I just finished the vacuum brake conversion on my 87 Grand National and I'm experiencing a hard pedal. (I know, its a turbo buick, go post it on the turbo buick forum!) I did, but I'm also posting here since there are more people here who are likely to have problems with vacuum brakes.

I used a reman booster and mc from autozone. The problem is the pedal is hard and the brakes aren't that powerful. It kind of feels like manual brakes right now.

I was going to try and bleed the system again, but wouldn't air in the system make the pedal soft?

I have the vacuum block from kirban's which allows you to connect the vacuum hose and I'm using a vacuum hose off a non-turbo car, however, it has a check valve in it before the hose gets to the booster? Is this still necessary on a turbo car? The system seems to be drawing vacuum since I can hear the engine idle change a little bit when I press on the brakes. Could my problem be the system not getting enough vacuum?

And the pedal feels normal in park, but in drive it feels more stiff.

Let me know what you guys think. I'm going to try and re-bleed the brakes tomorrow as well as test the check valve on the booster.

Thanks,
Mike

 

[pontiacgp]

If they felt like manual brakes they'd be working great. Is the check valve in the right way?