
Worst One Award! Here you go~(*´ω`*)Whee
Probably definitely surely not happy about it…
Don’t worry, nobody will understand anyway…. probably.
Not knowing things have come to this? Starting caliper disassembly~

At first I recommended buying Nissin instead—it’s faster! Cheaper! Better? But once we disassembled it, it turned out to have aluminum pistons.
So we decided to do an overhaul and just replace the seals. That’s how it goes.



Poor piston operation = dust seal deformation and body corrosion
The dust seal deforms and constantly contacts the piston, so both extension and retraction become sluggish.
When the caliper piston doesn’t move well, overhaul and cleaning with seal replacement is the only option.

The center part just won’t come out no matter what…
The inner diameter is solid and the wall is thick, so I removed it with a bearing puller.
A bearing puller works better when you don’t apply it directly —it’s gentler that way.
An inexpensive puller is sufficient.


The gunk and corrosion are unbelievable! First, let’s remove it~
Wet blasting alone won’t work right away, so I’ll grind it off with a Nakanishi.


Nakanishi E-MAX Revolution
Well, it’s not cheap, but once you use it, the quality is worth it.
Keyless with replaceable tips, motor in the handpiece so expandable too.
Completely professional-grade finish. I think it’s really durable.

There’s some corrosion on the body side too.
Even with an overhaul, wear on the body itself can’t be helped.
Think of it as cleaning and replacing consumables— that level of overhaul~




Check the piston diameter and length.
27-27-24 six-piston caliper.
Six-piston disappeared, didn’t it… and Axial too…


Always check one, two
Don’t use new parts without opening and inspecting them. Ever…
By the time it reaches your hands, many people have been involved . During that time, dozens of checks have been done already.
However, there have been cases of wrong items mixed in.
The bike owner is the one who gets hurt. It’s best if the mechanic catches it before responsibility becomes an issue.
Peace is best… Zenigata…

Magic Chemical CCI MR20 Matches Brembo?
For domestic calipers, I get the impression you shouldn’t use grease-based products much.
The lubrication performance of this CCI MR20 is amazing.
“Smooth! Pop!” It slides in smoothly, no doubt about it.

If the operation is smooth and static, I think you’re good.
Now it’s just assembly~

The master tank won’t fit (the angle doesn’t match), so I had to remake the bracket.
To be continued