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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.
 

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It could be a bad booster or check valve I would check out Master power brakes troubleshooting guide. You need at least 18 inches of vacuum for a booster. Also the Booster could be to small.
 

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Cheap pads can do that...most people who have been down that road say that the porterfield or EBC brand pads are what you need....opentracker can get them to you. I would try a pad swap before ditching the system. I'm running granada on 2 of my cars...no issues, and i have the cheapie pads....
 
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It could also be that your master cylinder is the wrong bore size or is bad. Or the pushrod is the wrong length. Just adding a couple of things to the pile to check out.

Usually a bad booster manifests as a squishy pedal IIRC.
 

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Cheap pads can do that...most people who have been down that road say that the porterfield or EBC brand pads are what you need....opentracker can get them to you. I would try a pad swap before ditching the system. I'm running granada on 2 of my cars...no issues, and i have the cheapie pads....
^ what he said. You wouldn’t believe the crap pad formulations that are at the chain auto part stores. The Cardboard from the box would literally be a better friction material than what you get on the pads inside.

ex-Global West GM
1991-1995
 
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