Originally Posted by Evildky

I do not left foot brake. The canister I bought has it's own check valve. It's been a while but as i recall I ran a new hose from the OE port on the manifold to the vac canister (pretty side that the side that had the check valve on the canister, then form the canister back to the OE vac tube that crosses back over to the booster (check valve is located on the booster iirc). I verified that the booster and check valve worked correctly and held vacuum and that the canister was holding vacuum and that the check valves was working properly. The only problem with this method is it still relies on the engine to build vacuum, while I did not measure the vacuum I did verify that it held vacuum, so it's possible wiht a vac pump you could pull more vacuum, the reason I left it there was that under moderate or ramped up braking it had plenty of boost with good pedal feel, no reason to suspect lack of vacuum at that point. Feel free to pursue this, I expect you'll find the same result I did.