Any advice re brakes on Ducato 1.9TD 1993 Camper, recently had fitted two brake pipes, on return from France brake pressure went on M5. Brakes can be 'pumped up' but when engine running ie servo on, the pedal with some effort, can be pressed to the floor. I suspect master cylinder. There's no warning lights, fluid level is ok and there's no fluid around the wheels or engine comp. Urgent help needed. Stuck in Wigan!! BillS