Originally Posted by 
yt110
				
			 
			glenn
First off I have never worked on a rangie so I have no idea what I'm talking about.
But I had a look at the RAVE cd and the method of bleeding the primary and secondary systems
Have you been using this method? ie what bleeders to open and when.
On the topic of low vaccuum.
My county has an extra vaccuum tank standard and when I fitted the rear Maxi diff lock the kit came with another vaccuum tank.I don't know the how well the vaccuum pump on the alt. works,you system may benifit from the addition of another tank. 
Re your "dodgy" master cylinder,I read that when you removed the pipes and sealed the outlets with bolts the pedal stayed up,that would suggest the M/Cly to be OK.
 Jim.