Hi Robert If holding your foot on the brake and the pedal goes down ,If there is no leaks anywhere I think you will find it to be the master cylinder leaking back past the seals and back into the chamber--Master cylinder -E-Bay==£35. And have you "seen" this about gear box fault the same the same as your problem---- RE: Problems with S type auto gear box It is the shift cable. It just needs adjusted You need a15/16 wrench and vice grips. Fung fu grip the center console off the car. Put it in neutral. Then put the vice grips just behind the nut, on the metal. Back off one of the nuts a little, then tighten the other side. It will move the cable inside. Then put it from neutral to reverse and back to neutral and back to drive. The distance between R-N and N-D should be the same. The letters should light up at same distance I mean. If it isnt, go the other direction. If you are not comfortable doing that, have someone else do it. But it is just an adjustment. If needed I have a more detailed way to do it .I will put it up if wanted.???? Frank