Here's a photo of the vac. hose between my brake booster and vac pump.....notice the nice spilt. Subtle but evident source of vac. leak.....Rob M Concord, MA PS when troubleshooting be sure and reconnect the hose to the booster. The brakes are a tad different without the vac. booster end of the hose connected.....Also the nipple on that plastic piece is fragile so...lets be careful in there....Rob M