Rebuilding (not master) cylinder brakes

[froche]

I rebuilt brake cylinders on all 3 brakes. Items i have noticed and a tip.

1) All 3 cylinders were "broken" because both pistons in each cylinder did not come out at the same rate, and even got stuck.
2) Speed Bleeders are really great!
3) A Dremel tool with a brass wire brush (see picture) is perfect for cleaning out the recesses that hold the hydraulic and dust o rings. Figured this out when i didn't use this on the back brake, pistons push in much easier after.
4) A glue type needle injector is a great tool to have for lubing the pistons when pushing in.
5) A drill mounted scrunge pad works great and shouldn't remove any metal.

brass wire brush

'

scrunge pad

[WingAdmin]

Be careful, as many aluminum alloys are softer than brass, and a brass brush will score the cylinder walls, which is then going to wear out the new seals very quickly. You might be better off using nylon bristle brushes in your Dremel:

https://www.amazon.com/Dremel-403-02-Ny ... B015PK3BC8

[froche]

Yes soft aluminium vs hard brass can be a problem. In my case the brass brush was fairly soft and the RPM on the dremel was fairly low (variable speed unit). But I didn't work real hard just a few times around and not pushing too hard, just enough to get rubber and corrosion off.