1999 voyager 2.5 td brakes
 

Hi having a small issue with my brakes engine off put pressure on brake peadle move's a few cm's and then stops moving (how it should be i would have though) this is the best bit keep the same pressur on and start the engine , slowly the peadle move down to the floor (this car't be right)but driving the beast, brakes seem fine and stops when asked. first though was the master cycinder and second though the most expensive bit the ABS unit has any one had the same trouble??????

Regards dave