Join Date: Nov 2000
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Re: Anybody done the E350 master cylinder swap?
Check the POR board, as there was considerable discussion on this swap.
There are individuals who swear by this modification, even for rear drums.
Personally, I only believe it would make a difference if a lack of volume of fluid movement is the problem due to larger diameter rear disks or wheel cylinders. And that may be the case, comparing the small diameter of a wheel cylinder to a disk brakes caliper piston. If there is sufficient volume, a larger diameter master cylinder will in fact decrease system pressure and make the problem worse.
If lack of pressure is the issue, then I would suggest swapping to a dual diaphragm brake booster from an 80's gm car or truck. These provide twice the power assist.
There has also been mention of a corvette master cylinder as it was made for 4 wheel disks.