I WOULD NOT remove the proportioning valve.... you most likely need that -- and at the very least -- need to understand WHY you don't have good brakes before doing something like that.
You do need to do as suggested and check the vacuum - at the take off port for the brake booster.... at the engine. Or if you have a small vacuum gauge hose - at one of the other ports.
If you don't know how to do this - or don't have a gauge - it's a very simple (therefore should be super inexpensive) to have a shop do it for you.
After you do that -- check the brake pedal ratio....
Here's a link to show you what that is:
Next --- open the master cylinder -- tell us if there is a larger volume between the two reservoirs.... the larger (if there is a difference) needs to serve the FRONT brakes -- and the smaller (if there is a difference) needs to go to the rear. You can simply follow the lines to find if they go to the front or to the back.
Did you BED the brakes after the installation?? Do you know what this means??
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