I'm owner of a 1969 E-Type Roadster since 1993.Since nearly 3 Years I have a problem with my brakes.During hot waeather or when used in town the brakes stay on for several seconds.Nearly all the parts of the brake system have been changed but after a while the problem always comes back.My last hope was the advice of aspecialist to add a spring in the servo.But this didn't help either.Can anybody help?