Can only get a brake when you pump the pedal. Hold the pedal hard and it will gradually go to the floor. Work done so far: new discs on the front, and handbrake linings renewed, which is not to do with this problem as it is a separate system. We have replaced with a new master cylinder and a second hand servo from another car, all brake pipes and wheel cylinders have been checked for leaks, but this still hasn't cured this problem. Anyone else got an answer to this problem.