jmd_forest
Bldg 1980 XS400 Cafe Bike
I just finished rebuilding the front Master Cylinder on our father/son cafe project (better the bike stops fast than goes fast) and am getting no pressure that I can see. When I pump the handle the brake fluid pumps into the reservoir. The cylinder seemed in reasonable good shape and I polished it up with 360 grit wet/dry paper before assembly. The exploded view in the manual does not match our unit exactly and is also slightly unclear. I believe I've got the rubber seal around the piston on correctly (fat end of the bevel towards the hose) but not so sure about the rubber seal on top of the spring. Does the spring fit into the cup end of the seal or does the cup end of the seal point towards the piston?Any other ideas on why I'm betting no pressure? I do get fluid down to the caliber which has also been rebuilt. The handle is not just soft, there's no resistance at all.