Topic: brake bleeding questions.. with bleeder

[the technological J]

has any one used a bleeder like this? it has a guage  that is supposed to be in inches of mercury.. but i dont really understand it i just pump it up and open the bleeder.. is there more to it than that...
oh heres the link to it
http://www.cyclegear.com/spgm.cfm?L1=&L2=&L3=&L4=&item=USI_990083

it worked well for  a couple master cylinders that didnt push the fluid to pressure but i still feel like somethings off

[bollingball]

tech just look at the gauge before it gets to zero turn the bleeder off if not you could let air back into the system.

[Johnie]

That is just a basic vaccum system to suck the air out of the lines. As you bleed the brakes you want to be sure you create a vaccum and that is what the gauge is for. I have the MityVac which is the same deal. They work nice especially after a master cylinder rebuild if you have trouble getting the air out. Have the bleeder closed, then pump the handle to 5 or 10 is what mine says, then slowly open the bleeder and watch the bubbles come out. If you have a ton of small bubbles that means air is getting in past the bleeder threads. If that happens you will need to put a little teflon tape on the threads which works for me.