Hi Ronno6:
So after all is said and done on this issue, what do you attribute your rear lockup problem and low front braking force to?
Regards,
Henry
FWIW I believe that the JB5 rears are sent more pressure than the JB3 rears, due to the larger shoes but smaller bore cylinder.
This higher pressure would cause the narrower and smaller dia. JB3 shoes to lock up against the drums, especially as there was no load in the bed. This would happen prior to the combo valve sensing the pressure buildup and sending adequate pressure to the front calipers.
The system is now working as designed,
I believe that the mix of systems could not achieve balance.
My post of July 14th may explain the hows and whys, dunno 4 sure.
On another forum I ran across a member who had experienced the exact same symptom with the exact same mix of systems.
The only fix that worked for him was the one which worked for me.
Remote as it may be to believe, maybe the GM engineers had method to their madness........