Drum to Disk

[confede]

Hey guys....I have a 69 Charger that used to be all drum with power brakes.  I put Wilwood front disk brakes on the car and changed the master cylinder.  Problem is - it consistently blows Master Cylinders.  The brakes should be the best part of the car - but they never have felt right.  THere is a slight cam to it - but I wouldn't see that as blowing out master cylilnders all the time.
It seems to me that possibly that piston goes into the master cylinder too far - which got me to thinking that the power brake booster was for drum brakes and possibly not as wide as one for drum brakes....anyone run into this before?  I am running a disk master cylinder - but apparently a drum power brake booster - could this be the problem?
Thank Yall!

[is_it_EVER_done?]

What exactly do you mean by "blowing out the master cylinder"? Also, what MC are you using.

[confede]

I am using a stock 69 disk brake master cylinder.  Once a new one is on - it will be leaking within a month or sooner - this current one is pouring out the back where it attaches to the power brake booster.

[69pistolgripRT]

When the m/c is working how are the brakes? Does it pull to one side?
Did you adjust the linkage at all and do the brakes ever stay locked up after you release the pedal.

[is_it_EVER_done?]

Your drum booster is not your problem as long as it's in good shape (no vacuum leaks).

Have you tried adjusting the booster push rod that goes into the master cylinder? Make sure that it's not depressing the MC at all when the MC is flush to the booster. If it is, the brakes will stay slightly applied which will generate heat that may be causing the MC to distort and leak.

If the adjustment is correct with no pre-load on the MC plunger, the only other things that I can think of would be a bad run of MC's or fluid contamination, however if it was fluid contamination, you should be seeing leaks at the brakes themselves, and even though I one time had a string of three bad re-built MC's (fourth one was good, and still is 15 years later), It sounds as though you have gone through many, which renders that potential a nearly mathematical impossibility.

Sorry I can't be more help.