<VV> Flushing the brake lines

[Stephen Upham]

If you open all of the bleeder valves in order to flush the system,  
shouldn't the reservoir run dry as the fluid leaks out of the lines -  
the so called gravity flush?  OK, when that doesn't happen, if you  
press the brake pedal, shouldn't that cause the reservoir to pump  
fluid to the lines that would then flow out of the open bleeder  
valves?  I'm getting nothing.  The pedal goes to the floor, but no  
fluid loss in the reservoir or in the pans under the bleeder valves.   
I used a Mityvac at the extract the fluid from the line at each  
bleeder valve.  I developed pressure with the pump hose on the  
bleeder valve and then opened the valve.   I did this on all four  
wheels.  I got about two table spoons of fluid collectively from all  
four wheels.  I have replaced the rear flexible lines yesterday and  
today, but the fluid loss from that was less than a teaspoon full total.

Help.


Stephen U