I'm in the process of building my own pressure bleeding tool for my truck.
How much pressure is required to bleed a system? I'm guessing around 5psi.
Does anyone know for sure?

 

I just bought a preassure bleeding system. The insructions said 5 to 10 pounds. The Chilton manual suggests that 15 to 20 pounds should be plenty.

After using it, I would report that 15 pounds was great for the rears. I was unable to bleed the fronts by preassure - had to go the old foot on the pedal method.

I guess there is a trick to it , but for now I have my brake pedal back, and have pretty much flushed and replaced my brake fluid. I was surprised how much rusty crud came out!

 

My new brake bleeding tool worked like a charm, it's much easier and works
better than the two man system.When I get a chance I'll photograph it
and post the pictures.

 

One thing to remember when using the brake pedal bleed. Put a block of wood under the pedal and don't let it go all the way to the floor. The usual brake pedal usage keeps part of the shaft nice and shiny. The other part gets rusty and crusty.(visualize a shock absorber shaft) If you push the pedal shaft all the way in, the crusty part can destroy the master cylinder seals.