Question When parking, you should not use the parking brake if: Answers The brakes are very hot. The brakes are very cold. There is snow on the ground. Explanation If your brakes are hot after coming down a steep grade, you should not use your parking brake when parking. Let your brakes cool before applying the parking brake or risk damaging the brakes. Take a FREE Practice Test Now This questions appears in the following tests: Alaska Knowledge Test Class A , Connecticut Knowledge Test Class A , Mississippi Bus , California Double , Alabama Air Brakes , Arizona Air Brakes , Arkansas Air Brakes , Iowa Air Brakes , Maine Air Brakes ,