You should not use the parking brake:

Question

A parking brake should not be used if the vehicle's brakes are very hot from use on a steep downgrade or if the brakes are very wet and temperatures are freezing. Using the parking brake when brakes are hot could cause damage to the brakes, and using the brakes when they are wet in freezing weather may cause the brakes to ice up, rendering the vehicle immobile.

Accepted Answer

If your vehicle's brakes are very hot.

Answer

If your vehicle is stopped on a level surface.

Answer

If your vehicle is stopped on a slight incline.

Answer

If your vehicle's other braking systems seem to be working adequately.