Hey,

So I went ahead and did a caliper rebuild after the seals came in. I totally forgot to push the pistons out of the calipers before I took them apart. So now I have disassembled calipers with no good way of taking the pistons out.

Fast forward, I didn't want to nick the pistons by prying or pulling them out with pliers. These pistons are stuck hence the reason for the rebuild. So I figured I would just put the calipers back together and pump the pistons out.

I put the calipers together and mount them back on the bike but when I go to bleed them, the bubbles don't stop coming out. I figure the calipers lost about half their fluid and same thing with the lines, I've been through about a quart of oil and the bubbles are still there and there is zero pressure in the brake system so I am unable to push the pistons out.

My question is, did I miss a step in bleeding the brakes? If keep the reservoir cap off when bleeding, would this introduce new air in the system?

Thanks for the help.

 

The best way to get the pistons out is to use compressed air. Make sure to have the pads still in there to stop the pistons and KEEP YOUR FINGER CLEAR. A few short puffs will pop them right out.

Bleeding is tricky. There are many threads on it. Some push fluid back up through the system while some manage to just bleed it. When you get a lot of air in there, it's hard to get it all out.