There's one thing that confuses me about them. Ok, you buy four of them and put one on each caliper. Do you bleed all four corners at once or still one at a time?

 

As long as the check valve is operating good on all 4, theoretically you could do all at once. I'd do the rear first, though, because of the longer fluid runs...

If you do all 4 together, keep a close eye on the reservoir level, it'll get sucked down pretty quickly...

 

Ok. Thanks!