Brake fluid shelf life ?

[kevin#34]

any idea about which could be the shelf life for well stored (dry room, not exposed to sunlight) and sealed brake fluid bottles?

[PZ.]

Years. Or until the plastic degrades enough to leak.

[kevin#34]

ok thanks, so even 4/5 years could be ok?
I ask because I still have 2 sealed bottle of Castrol SRF that is really expensive, would like to use them....

[henri12]

In plastics, 5 years according to Castrol.

[wkhanna]

if unopened, yep, i would say up to five years would be ok.
i would never use brake fluid that has been previously opened.
most brake fluids are highly hygroscopic, meaning, they absorb water from the atmosphere like a sponge.
water in brake fluid is bad.
the heat generated by the pad/rotor friction will heat the fluid in the caliper.
any moisture in the fluid will begin to boil and create steam.
the steam is compressible and results in a mushy feeling brake pedal and loss of braking performance.
that moisture can also cause corrosion in the caliper pistons.