Since the rear braking wasn’t quite up to par, we replaced the master cup piston—a spot that often goes overlooked during maintenance—and polished it clean at the same time.
Not much distance has been covered since last time, so the pads are still in good shape. The front brakes are working well. The rear feels a bit stiff, but we’ll keep an eye on it for now.
It’s hard to believe, but this K6 has already been around for ten years.
Left is new, right is old—it’s slightly swollen and the umbrella is starting to close. While it’s not a spot that typically leaks and causes problems, it’s an area where moisture and debris can accumulate, so if it’s never been checked before, it’s worth inspecting.
The side is worn and shiny. The cup debris is likely a mix of metal particles.
We discovered that by lowering the grit on the plate, we can lightly polish just the surface. It comes out looking brand new.
We replaced the front and rear brake fluid and clutch fluid.
• Front and rear brake and clutch fluid replacement: 2 points × 4 = 8 points
• Rear master overhaul = 6 points
• Polishing work = 2 points
• Caliper cleaning and bleeding: 2 points × 3 = 6 points
• Chain cleaning and adjustment = 2 points
• Front fork lubrication = 1 point
Total: 25 points. Normally, rear master overhaul is not offered as a standard service. This is an example of a test case we performed.
