I am trying to refill a Shimano Alfine BR-S500 disk brake system with oil. I have filled the reservoir with mineral oil...
And am repeatedly squeezing the lever, but it feels like no oil is getting pushed into the hose line.
(Note that it is hard to see the clear oil in this photo, but the reservoir is full and the intake hole is submerged).
I have the bleeder at the bottom open 1/8 turn. I have also tried cracking the caliper apart just to see if any oil is coming down the line when I squeeze the lever, but none does.
The brakes were working fine before I drained it.
What am I doing wrong? How can I get the oil into the lines and into the caliper and pistons?
According to the manual, this system is not filled from the bottom like most oil-based bike brakes. Instead it says to open the bleeder at the caliper and then fill the reservoir up at the lever and pump the oil down.
(BTW: It is empty because I had opened the calipers to replace the o-ring in between the two halves.)