Installed granada spindles and new brake kit a few years back. As part of switching from manual to power. Also replaced pedal for power. Never liked stopping power. They will not lock up not matter how hard i step on. Was playing with proportioning valve I put on. Basically controls the flow to back. closed completely maybe a slight better but still won’t stop well Or lock up. I have a hard pedal pretty sure no air in the lines. Kind of stuck on best way to troubleshoot other than replacing a part at a time. Tempted to replace to original drums spindles and go with a new setup. I’ve got a pretty hot motor. Actually installed a pre air tank and pump for vacuum no help so I dont think vacuum related. brakes are actually a little unsafe. Any advice appreciate.