I changed my rear from drum to disks. I am not getting any pedal presure. do i need to also swap my master cylinder for more volume of fluid?

The whole brake system is now all rebuild parts, all calapers, master cylinder and power booster. stainless steel lines too. I also put on an adjustable proportioning valve.

How much vacume should the engine be making?

 

The masters are different for the 2 systems, dont know if that is your whole problem or not.
How did you bleed your brakes? rx7doctor

 

Where in Huntsville are you?

 

I have speed bleeder on rear. Bled MC-RR-LR-RF-LF. Tryed using a vacume pump to bleed but it didn't work so had someone pump and turned the screw then closed it.

I am actually in harvest, al

 

You either have a leak somewhere to allow air in or the master cylinder isn't right. Like doc said.

On a side note, there are very few of us 1st gens in this area. Went to the BBQ Sunday and I was the only running 1st gen there. The other 1st gen is getting an FD motor so I don't count that. 4 2nd gens, and about 9 3rds, and 2 RX-8's. Drop me a line I usually have nothing better to do on the weekends besides work on the 7.

 

The master cylinder for the drum brakes works fine with disc brakes, it's what I'm using right now.

 

yeah it should work fine just bleed bleed bleed man and youll be fine my brakes work great i just went through what you did and i havent installed the p valve yet so ill be bleeding my **** all over again.