Brake Flush w/ Pressure Bleeder not pushing Fluid through lines

[Hein Jockins]

As title says, I attempted to perform a flush with a new Schwaben power bleeder. Bleeder was able to hold pressure at 15lbs, yet only extremely minimal to no fluid was coming out of caliper when valve cracked.

What's interesting is I was able to perform a flush by pumping the pedal which I would assume eliminates any issues with the brake lines. So what's left? Issue w/ the powder bleeder. Except it was able to hold pressure fine. How can 15 lbs be pushing fluid into an open circuit (w/ valve cracked), yet the fluid does not come out?

[deansbimmer]

When this happens it's usually because the bleeder ports are corroded and 15psi isn't enough to overcome the blockages. Remove the bleeders and see if the flow improves. If it does, replace the bleeders. If it doesn't, the calipers will need to be rebuilt or replaced.

[Hein Jockins]

Originally Posted by deansbimmer

When this happens it's usually because the bleeder ports are corroded and 15psi isn't enough to overcome the blockages. Remove the bleeders and see if the flow improves. If it does, replace the bleeders. If it doesn't, the calipers will need to be rebuilt or replaced.

Pedal bleeding was still effective though, but is that just cause pumping a pedal 5-6 times is more than 15 psi? So there could still be some sort of blockage?

[deansbimmer]

Originally Posted by Hein Jockins

Pedal bleeding was still effective though, but is that just cause pumping a pedal 5-6 times is more than 15 psi? So there could still be some sort of blockage?

These brakes can reach 200x more line pressure than a bleeding pot, so yes...unless your brakes don't work at all, there's a blockage at the bleeders.

[Hein Jockins]

Originally Posted by deansbimmer

These brakes can reach 200x more line pressure than a bleeding pot, so yes...unless your brakes don't work at all, there's a blockage at the bleeders.

This might explain everything hah. Thank you. I'll check for any noticeable blockages and see what can be done and move to caliper rebuild if completely necessary.