LCAM-01XA
Full Access Member
If you can get to it, unplug the the vacuum pump hose from the vacuum tree, and shove the tester in that hose, this will tell you what the pump alone is doing. Then if that checks out plug that hose back onto the tree, and pull the vacuum hose off the brake booster (careful not to break that small valve at the end) and test that hose, this will tell you how much vacuum actually reaches the brake booster. Unplugging the smaller vacuum hoses off the tree to get them out of the way is fine, as long as you remember to plug them back on when you're done - I've noticed that once unplugged, the hoses usually need about 1/2" length cut off their ends before plugged back on, that removes the already stretched ends and exposes fresh hose that would make for a better seal to the vacuum tree.