Hey  yall i gots a question for ya. I have a 87 jx with toyota axles under it. The brakes work ok but im thinking that i need to get a bigger master cylinder for the axles.
i have a *8 inch front and a LC rear with 4 wheel cylinders. i dont kn ow if my master cylinder is able to push enough fluid for my brakes and im hoping some one here has had the same problem and mite have a solution for me, or some good advise.
Also has anyone had a porportioning valve go out and if so how did the brakes act?

thanks a bunch.

   When my proportioning valve let go I lost my back brakes.I thought I had lost a wheel cylinder or something but it was the valve.

http://www.zukikrawlers.com/showthread.php?t=10552&page=4

Alot of good info in this buildup. But a good write up on swapping master cylinders.

thanks for the insite about the mastercylinder. I have one out of a f150 and it has a very similar mounting setup too, so i mite try it.

thanks for the link it has alot of good stuff on it that i will keep in mind for my future plans