Does anyone know of a product that can be used to control brake vacuum. I have a motor with a big enough cam that it produces low vacuum. I wanted to keep my power brakes so I installed a belt driven vacuum pump like that used on diesel trucks, this one is a cardone 64-1029. It is producing about 25" vacuum but it is not good to exceed 20'-21 " vacuum on a brake booster. I need something to bleed off some vacuum to control it at about 19"-20". At the moment I have a small hole in the vacuum line but it is not always accurate. I imagine something like a turbo wastegate works only for vacuum. thanks.
