I have a 1994 non-abs del sol Si and replaced the front passenger caliper. Upon bleeding with the car turned off I get a great stiff pedal feel. Then I turn the car on and I don't know what happens but the pedal goes from stiff to spongy again. I only bled that one wheel but that's the only place I opened the system. Is it possible having an old caliper on the driver side is causing some sort of imbalance?