need help, brake conversion problems..

[tommie]

i have a 70' 1/2 ton swb. i converted the front to disc (6 lug) using a kit from GMC paul. i have replaced the master cylinder with one for a 71' chevy truck, non power, and a new proportioning valve for a 71' i bought all new steel ines from inline tube, and replaced the rear drums, shoes, wheel cylinders, springs. basicalyeverything is new...

the pedal has always felt very hard, i know, i don't have power brakes, but when the truck had 4 drums and now power the pedal effort was less.

i drove a friends truck tonight after aligning it, he converted his brakes to disc up front no power, and his pedal effort was much less, he is using a newer aluminum master cylinder though..

what kind of problems do you think i could have?

i was thinking it could be the master cylinder mabey? or could it be something with the kit i got from GMC paul? the kit was to put rotors on using 73-87 spindles for 1.25" think rotors. mabey the bore size is different on the calipers since they are for a 73-87?

any ideas?

thanks for the replies
tommie