When oil temperature rises, the clutch slightly slips.
From experience, I figured it was probably a clogged return port causing the “firm pressure” issue.
→That was correct.
When I opened the clutch cover… hmm, it’s pretty bad.
As expected, I was relieved.
Fluid should ideally be replaced at least every two years for peace of mind.
Brake fluid is hygroscopic. It absorbs moisture from the air, which causes internal corrosion.
【Ethylene glycol, the main component of brake fluid, has the property of absorbing water vapor from the air. The rate at which it absorbs this water vapor is called the hygroscopic rate.
It’s similar to how we call the proportion of water vapor in the air humidity.】
Even before this state, it wasn’t returning, so it seems like it’s probably clogged.
The hole in the return port here is open. When that gets clogged, pressure doesn’t escape and it becomes firm.
It won’t suddenly lock up, but the brake system can do the same, so it’s a critical area to watch.
The firm state and the state after the hole is cleared.
I went ahead and replaced all the fluid.
If corrosion develops again soon, we’ll need to do a complete overhaul.
Let’s watch it for now—at least we’ve made progress.
