4 wheel disc conversion question (M/C)

[kbeefy]

Okay, so I've got this 70 'burban k20 and the brakes were crap. For several different reasons I wound up putting later model axles under it (D44 and 14bFF) along with a rear disc brake conversion. So now, I have basically mid seventies k20 front brake calipers all around, but still have the stock master cylinder (it's power brakes, btw). They work pretty well, but the pedal is pretty soft and I can push it all the way to the floor. I'm guessing that this little master cylinder isn't pushing enough fluid to work the calipers really well, but it is working fairly evenly, due to the front and rear portions of the master cylinder being about equal.

So, after that enthralling introduction, my questionis this: Does anyone know of a master cylinder I can install that has a larger bore to handle the disc brakes (higher flow, more pressure etc) and is equal front to rear (not like one w/ front disc - rear drum)?



Thanks in advance for any advice!