The hose fittings are made of mild steel that, given the propensity for water to collect in the wells due to blocked drain holes, can rust through.
Be careful - if leaking fluid comes out of the drain holes (on either side of the car) which are just in front of each rear wheel...
Hydraulic fluid + turning wheel under load = ditchfinder.
If that's your problem, it's possible to replace with stainless.