| I have not worked on one quite that new, but if it is like the older models, you simply take off the outer rubber boot and the cup and spring will come out easily with a little air pressure in the hose port. Observe how the pieces fit together, and especially which direction the rubber cup is turned. Back in the old days before cheap Mexico and China parts, brake and clutch cylinders were often rebuilt with new kits.
Check the bore for pitting. If there are any pits, best to get a new cylinder. If it is just surface rust or marks, it can likely be cleaned up. To do this, buy a small cylinder hone at an auto parts store, which can be attached to a hand drill. Using diesel fuel as a lubricant, submerge the cylinder in a small can and run the hone up and down in the cylinder running the drill at a slow to medium speed if you have a variable speed drill. Check it to see if the marking is gone, and if not, repeat the process. You should end up with a cross-hatched pattern on the cylinder wall. When done, wash the cylinder in clean solvent and reassemble with new parts in the reverse order you disassembled. |