UPDATE: ----AT POST 56 OF THIS THREAD I'VE BECOME LESS SURE THAT THE REMOVAL OF THESE "VALVE THINGIES" WILL BE HARMFUL AND NEED STILL MORE HELP TO BE ABLE TO UNDERSTAND WHAT EXACTLY THEY DO. - Sorry if the title of this thread has raised alarm unnecessarily (Still too early for me to tell) Lostmarbles -1 November 07 It is becoming apparent (to me at least) that there may be a serious safety issue concerning the modifications some people are making to their brake mastercylinders. I am talking about the removal of so-called "residual valves". Have a look at the posts in my thread "What are these" to see what I'm talking about. Here's the link (if I can follow Pin_Head's advice properly): http://forum.ih8mud.com/showthread.php?t=185090 It is possible there are other types (to mine) of "residual valves" fitted ex-factory to our 40 series cruisers - but I can say for certain that my type are there to serve an important safety function. (And that function is just as important for a vehicle fitted with disc brakes as it is for one fitted with all-drums.) Yet it appears to me as though some of these same-type valves are being discarded during vehicle modification work. Any comments?