Back brake leaking!

[Kaybe]

Found this after c150 miles today, bit disconcerting, a leaky nipple!
Bike only done 4000 miles.

Nipped up about 1/6 turn and now appears leak tight.

Reservoir just above min mark.

 

[CPJS]

Who was the last person to fiddle with your nipples!

 

[Winjar]

Bad nipple day, check rear pedal have resistance.

 

[PhilBoy]

It’s the vibrations shaking it lose.

 

[Boxerlust]

Leaky lactating nipples are never a good thing...

 

[meintjiesj]

I noticed the same problem on my bike a few weeks ago after a 200 mile trip. Two weeks prior it went in for a service and the brake fluid was changed. Tried tightening the nipple but was already tight enough. Will maybe need to replace it I think.