Originally Posted by
base2
SRAM DOT brake system?
Every single brake system I have seen that has the behavior that you describe has been a SRAM DOT system.
The fluid, although supposedly higher performing (resistant to boiling) when new, is very hydroscopic. It literally sucks moisture through the seals and quickly, quickly degrades becoming a greater volume of fluid...and poorer performing that mineral oil. Since the system is a fixed volume the pistons push out.
The "fix" is regular fluid replacement and bleeds.
You could also simply get a mineral oil based system like every other manufacturer that is not SRAM.
I have both SRAM and Shimano brakes and neither need bleeding on a regular basis and certainly not after just 6 months sitting in the garage. Humidity is pretty high here too.
Noisy pads were probably down to contamination just before going into storage. Maybe rust forming on the discs. Clean, dry discs and pads can sit happily for 6 months without issues. Calliper pistons can sieze up though if left unused for a long time.