I realize that hydraulic brakes are not at all an "old mini bike" thing, but I began rebuilding the bike's goofy Honda Inboard Disk this morning and figured I'd post a couple photos.
The caliper was already seized solid when I got the wheel almost 16 years ago, and it had been sitting dry, with no line connected, in a dusty corner of my garage ever since. Clearing the line took both master cylinder pressure from one side and a mityvac pump pulling on the bleeder from the other. Eventually, a big black plug of gook appeared in the bleeder tube. Once I pushed that through, I closed the bleeder and had no problem pumping the pistons out. Overall, it's in surprisingly good shape. There was a lot of crusted-on crud in all the crevices and some jellied residue inside, but I had been prepared for much worse. The pistons are probably reusable, but I already purchased new ones, along with new seals and boots. Now it all goes into the ultrasonic cleaner!
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The caliper was already seized solid when I got the wheel almost 16 years ago, and it had been sitting dry, with no line connected, in a dusty corner of my garage ever since. Clearing the line took both master cylinder pressure from one side and a mityvac pump pulling on the bleeder from the other. Eventually, a big black plug of gook appeared in the bleeder tube. Once I pushed that through, I closed the bleeder and had no problem pumping the pistons out. Overall, it's in surprisingly good shape. There was a lot of crusted-on crud in all the crevices and some jellied residue inside, but I had been prepared for much worse. The pistons are probably reusable, but I already purchased new ones, along with new seals and boots. Now it all goes into the ultrasonic cleaner!
View attachment 283049 View attachment 283050