disc conversion, rears locking up b4 fronts

[gearheadmatt]

I've upgraded fronts to the C5 vette PBR 2pot caliper and the rears run Caddy single pot w/parking brake.

Its still got the original master cylinder and prop valve but I'm locking the rears before the fronts.

I figured it'd be the other way around. Don't discs take higher pressure than drums (and therefore the fronts lock first?

Anybody else encountered this?

 

[regal81455]

Did you do the proportioning valve mod? If not, that would be where Id start.

 

[gearheadmatt]

Did you do the proportioning valve mod? If not, that would be where Id start.

neg. whats the mod?

 

[regal81455]

http://www.turbobuick.com/forums/2172766-post3.html

 

[gearheadmatt]

wurd. thanks man.