Your Owner's Manual will give you an interval of miles on when to check items on the vehicle such as:
One of the most important maintenance you can do for your vehicle is regular checks so it can perform better and last longer. A must-do maintance is to check your brakes; brake discs, brake pads and brake lines.
There are three areas you need to check brakes:
Look behind your wheel and you'll see a large shiny disc, this is your brake disc. The brake disc should have a nice sheen to it along the outward-facing side. Seeing a scratch or two is fine, but if you see major defects such as a bump or a rusty looking spot, then it's time to get it serviced.
The brake pads are harder to see with the wheel on, but if you peak around the side or top of the disc, you'l notice a clamp with a pad touching the disc. Brake pads are replaced more often and if your pads have gotten too thin you should replace them.
How thin should your pads be before you replace?
About the size of two CD's stacked on top of each other.
The brake lines connect the clamp holding down the brake pads and extend out to the rest of the car. If you see any cracks or lines that appear as they will snap, they made need replacing.
If you will be traveling in an area where you are at risk of severe winter weather, you should always travel with an emergency kit.