Hi and thanks for using 2CarPros.
Based on where you live plays a big role in this. However, it is never good to let a vehicle sit for extended periods of time. Gaskets, seals dry out and then begin leaking.
As far s the brakes, my only real concern would be rust on the brake lines. If the vehicle sits outside all the time and is driven once a week, rust can develop quickly, especially if it is parked on gravel or in the yard. Any steel line can fail such as the transmission lines, fuel lines, brake lines, engine cooler lines.
As far as the engine, you should be find. Make sure the oil gets changed no less than 3,000 miles or one year. Sitting allows condensation to develop in the engine, so keeping it changed is important.
Now, if you are paying 20,000 for a 2007, you really should check its value. That seems extremely high for that model year. It would have to be nearly new with hardly any miles on it. And with that low miles, other things can start happening once it is used again.
Let me know if this helps or if you have other specific questions.
Saturday, January 26th, 2019 AT 10:51 PM