What if I don't change my Master Cylinder on a disc conversion?

While the M/C doesn't have enuff fluid capacity to fill the void created as the disc brake pads wear,, it certainly has enuff capacity to work the disc brakes on a daily basis,, as long as you "top up" the M/C when you do your regular maintainance, to keep up with the pad wear...

To remove the residual pressure valve from that M/C,, simply remove the rear most reservoir's valve as shown in the vid,, (only leaving the M/C on the vehicle)..

http://www.bing.com/videos/search?q...&mid=FBA26E668FEAF993E5F9FBA26E668FEAF993E5F9

Brake fluid is excellent paint remover,, so if any gets on the paint, rinse with lotsa water immediately..

If you find the pedal overly hard to push,, changing to a smaller bore M/C will give an easier pedal, with better "feel"..

Rock Auto has them..

RAYBESTOS Part # MC36406 More Info {Professional Grade; Bore Size=15/16" Number of Ports=2 Primary Outlet Size=9/16x20 Secondary Outlet Size=1/2x20}
Front Disc Brakes; Rear Drum Brakes;
http://www.rockauto.com/catalog/more...117&cc=1088760

hope it helps