I just changed the brake pads on my Brembos for an autcross race tomorrow to Cobalt GT-Sports pads. When I went to bed the pads the brakes were really soft and never got better. Do I have to bleed the lines if I just change pads? I changed to Nismo pads for daily driving and this wasn't a problem. How is it possible for air to get in the lines from compressing the pistons? Any tips, my race is in 12 hours. Thanks.