New calipers, pads , brake booster , master cylinder, has low brake pressure on display, pedal is hard to push. Can I get pointed in the right direction please is it a pressure sensor mabeu a linkage problem computer module I'm looking for any and all answers I can check or diagnose I'm not sure yet if it has teves mark2 teves mark 4 or bosch abs system how can I tell the difference and what should I be looking into at this point? I LOVE THIS CAR