Tyres, Brakes and Suspension » Rear brake caliper leak out

This is a new one for me. Yesterday we were gardening so I was in the shed with the bike for other things and I noticed the rear drive "bell" was wet. Odd. It felt oily so it could be rear drive oil or brake fluid. I checked the rear master cylinder resevour and it was dry so I'm assuming brake fluid. When I bought the bike they talked me into 8 year, unlimited mileage coverage. I guess I'll be finding out how good that coverage really is. Has anyone run into this before? I assume unless something cracked the seals are gone but I've had motorcycles 15 years old that never exhibited this sort of failure.

Make sure to wash off the final drive and wheel.

Good point. I'd forgotten how costic brake fluid is.

A friend's RS started leaking at the bleed nipple- can't explain how that happened but a little extra torque stopped it.

Frank

A flashlight may help you find the leak.

This doesn't appear to be coming from the bleader nipple. It seems dry there but I could try it. I have an appointment scheduled to have it looked at Thursday. I would have to top off and bleed the system first to ride it in for service anyway. I can try that and cancel if that seems to fix it. The service writer seemed to think this would be covered by the extended warrantte if is was the seals leaking or a cracked caliper. I know this showed up last week because I washed the bike last weekend and I would have noticed it then. Also, there must be some small amount of fluid left in the system, enough to make it work because I still have back brakes. I would have noticed if they went out or if the pedal got soft.

Update on the situation. The dealer was able to take the bike in yesterday. They couldn't find anything. Drive isn't leaking. Pressure tested the caliper. Nothing. $84 to trouble shoot nothing. Remember I never lost brake performance or got a spongy brake pedal. They were thinking that the fluid dropped below the minimum due to normal pad wear. My bad for not topping off. Last time I would be able to swear I looked at the back brake reservoir was when I flushed the system for annual maintenance about a year and a half ago. If they're right, the only mystery is where the oily substance came from on the drive hub? I guess I'll just have to keep an eye on things for a while.

Zitat von Davidnapo im Beitrag #7

---

I guess I'll just have to keep an eye on things for a while.

---

Yeah, it's also hard to see the fluid through the translucent housing if you're replacing it every two years. I'll be checking by removing the cap for a while. Not sure what else the fluid could have been on the housing. There wasn't much.

Not sure what else the fluid could have been on the housing. There wasn't much.

Any chance the bevel oil was over-filled and the extra was forced out past the seals?

Brakes still working so maybe it is worth dumping out the current oil, confirm 180cc? and/or replace or refill with new

I suppose there's always that chance but when I add it, I add it with a syringe that is graduated in ml. I'm pretty careful about counting the number of syringes added. I will watch the area carefully for sure.