Final answer:
The correct method of braking on long or steep descents is to bring the speed down to about 5 MPH below the safe speed, then release the brakes to prevent them from overheating.
Step-by-step explanation:
The proper method of braking when going down long or steep grades, after selecting the proper gear, is to brake until your speed is about 5 MPH below your "safe" speed, then release your brakes. This technique is known as "snub braking" and helps prevent the brakes from overheating and losing effectiveness. It is also part of safe driving practices taught to drivers to maintain control of the vehicle on steep descents.