1991 Jeep Grand Wagoneer Brake Issue

How are the vacuum lines

Did they also change the brake booster check valve ?

I know they changed the brake booster, not sure about the check valve, the engine was gone through by a carburetor guy and he checked all the vacuum lines. Concern from the brakes mechanic was that the boater was in pieces when he pulled it out and he worried possibly some could be blocking the lines, but he’s not sure. He suggested I do a compression test which I agreed to, but both mechanics were unsure why the vacuum. pressure was low. Also after idling for a while the oil pressure was dropping to almost zero. Carb guy said the engine was tuned and he didn’t see any vacuum issues when it left the shop to go to the brake guy. I’ll ask about the check valve. I was also wondering if maybe you could splice the vacuum line with a narrower tube just ahead of where it attaches to increase pressure to the brakes, but neither mechanic knew if that would work.... I really really love this car, but my husband thinks I’m a bit crazy and possibly wasting my time

Booster not boater..

They said they replaced the valve with the brake booster but tested the vacuum pressure coming form the engine and it wasn’t putting out enough pressure