rear disk conversion

[gmcjimmy4x4]

I recently istalled a rear disk brake conversion on my rear 14 bolt ff. Does anyone know what i need to change in the combination valve. Its a 91 gmc jimmy with rear antilocks i think.I think its something to do with the porportioning valve and i already added a new valve just before the split at the rear axle.

 

[shane74]

What kind of pedal problems are you having?

 

[1985_K5_Silverado]

Are your rears locking up before your fronts or something like that?

 

[gmcjimmy4x4]

Its not locking up.They seem to be working properly, but i was told that their was a factory valve limiting rear brake presures subsequently the rear brakes wouldnt get full potential of its braking ability.