65 brake booster vacuum issue

So, my totally stock 65 driving down the highway and brake pedal is rock hard when trying to stop. Check the usual, hose (good), check valve seemed okay. Upon further inspection check valve seemed bad (air would pass either way). So I order new check valve, get it and install thinking problem solved, but no such luck. Start car up after it's warmed up I step on the pedal and sadly it is extremely hard to press, and when I do push pedal, the car starts to run rough (vacuum leak). Long story short, could it be something other than the brake booster needs to be replaced. Never had to replace one so not sure if I'm overlooking something.
 
So, my totally stock 65 driving down the highway and brake pedal is rock hard when trying to stop. Check the usual, hose (good), check valve seemed okay. Upon further inspection check valve seemed bad (air would pass either way). So I order new check valve, get it and install thinking problem solved, but no such luck. Start car up after it's warmed up I step on the pedal and sadly it is extremely hard to press, and when I do push pedal, the car starts to run rough (vacuum leak). Long story short, could it be something other than the brake booster needs to be replaced. Never had to replace one so not sure if I'm overlooking something.
I had the brake booster on my '63 rebuilt by Rock Auto, but I would suggest you check in the Dallas Texas area for repair shops. I found out that Rock Auto sent my booster to an outside shop in the Dallas area. It would be a lot quicker if you can find the company that did mine. Google, is probably the best way to find someone.
Good Luck
Buzzy
 
I just tried to start to remove early enough before it was up to 95 degrees, but like you said age definitely is a hindrance. Remember laying upside down under many dashboards. Not able to do that anymore.
 
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