Originally Posted By: Astro14
I tried them once on a Ford truck - they worked OK. Don't worry about valve failure (if they fail, it means you'll get a bad bleed, with air coming back in...they seal the same as regular bleeders...).
The hard part for me was this - I can't see the fluid coming out if I am pushing on the pedal, so how do I know when there's no air? I tried routing the tube up over the frame to keep it filled, but bubbles propagate up...so, I ended up with a helper anyway.
The Mityvac works OK for bleeding, but tends to suck air into the line from around the bleeder threads, so, again, determining when the air is purged is difficult at times.
Best thing I've found for bleeding is the Easybleed - but the pressure cap only fits on my Euro Cars, not the 2 Toyotas. So, for those 2 cars, I am back to the helper method, like I was 30 years ago...
It sucks air from the bleeder threads along with old brake fluid into the container, no air get back into brake line.