We see a lot of "winter vehicles" this time of year at Robison Service.
Do you see the dampness - the darkening on the curved rubber hose - that's brake fluid seeping out. And look at the deterioration of the top right fitting!
On most cars a set of hoses won't set you back much more that $200. It's pretty cheap considering the risk of letting them fail.
This is what the new lines look line, installed, for comparison:
In this particular vehicle we had to change three steel lines. The remaining lines were okay. Seeing the deterioration makes me wonder how many other ten year old cars are out there, uninspected, on the edge of catastrophic failure.