Its recently been cold, around 0 degrees C at night, where my bike is stored in the outside shed.
Ive replaced the pads, and bled the brakes around 6 months ago.
When taking out my bike it has 0% brake capacity initially, and the levers touch the handle bars without stopping the wheel.
After pumping them for around 5 minutes, they sharpen up to around 40%.
Then they jump between working (40%) and not (0%) randomly over the next 10-20 minutes.
What could the issue/fix be?
Should I re-bleed the brake fluid, replace the o-rings, or keep the bike indoors?
Should I be able to store my bike in a shed at low temperatures without the brakes breaking?