Pretty much it's recognised to change all mineral brake fluids on any vehicle @ two years due to hygroscopic tendencies of the fluid.
Personaly I think it's excessive as the fluid has a diaphragm between the air and fluid and should never come into contact with air/moisture.
The hoses and seals can contaminate the fluid causing it to darken, changing the fluid can slow the process and give the system a fresh feel.
'Never' top-up the fluid unless it's leaked out for some reason, low fluid indicates worn pads and if the fluid is topped up then there's no room for the fluid when the pistons are pushed in after fitting new ones.
Personaly I think it's excessive as the fluid has a diaphragm between the air and fluid and should never come into contact with air/moisture.
The hoses and seals can contaminate the fluid causing it to darken, changing the fluid can slow the process and give the system a fresh feel.
'Never' top-up the fluid unless it's leaked out for some reason, low fluid indicates worn pads and if the fluid is topped up then there's no room for the fluid when the pistons are pushed in after fitting new ones.