Brakes get hard as I pump

[motorsports_3]

I installed the Rx7 kit on my car recently and havent put many miles on it. I know I bled it well, but maybe it wasnt good enough.

When I am sitting in the car if I pump the brakes they get progessivly harder, as if I am hitting a wall. Also I have noticed that it seems the brakes get stuck at that "closed" position. For instance it happend when I was parking the other day. The car seemed to have a lot of drag coming from it, it turns out the brakes were closed on the calipers a bit. After the car sat for a little while it was fine.

Did I bleed them properly?

[2002maniac]

Check the brake pedal linkage. I had a similar problem a few years back after installing a new master cylinder. There was not enough freeplay in the pedal linkage so they stayed slightly engaged.

[Teaguer]

Issue with the sticking could be a number of problems.
But the hard effort sounds like a loss of assist.
Usually points to a leaky booster.